feat: implement some typed arrays

src/lib/libs/_entry.ts

@@ -1,21 +1,25 @@
 import { object, setGlobalPrototypes, target } from "./primordials.ts";
-import { Error, RangeError, SyntaxError, TypeError } from "./errors.ts";
+import { Error, RangeError, SyntaxError, TypeError } from "./values/errors.ts";
-import { Boolean } from "./boolean.ts";
+import { Boolean } from "./values/boolean.ts";
-import { Function } from "./function.ts";
+import { Function } from "./values/function.ts";
-import { Number } from "./number.ts";
+import { Number } from "./values/number.ts";
-import { Object } from "./object.ts";
+import { Object } from "./values/object.ts";
-import { String } from "./string.ts";
+import { String } from "./values/string.ts";
-import { Symbol } from "./symbol.ts";
+import { Symbol } from "./values/symbol.ts";
-import { Array } from "./array.ts";
+import { Array } from "./values/array.ts";
-import { Map, WeakMap } from "./map.ts";
+import { Map, WeakMap } from "./classes/map.ts";
-import { RegExp } from "./regex.ts";
+import { RegExp } from "./values/regex.ts";
-import { Date } from "./date.ts";
+import { Date } from "./classes/date.ts";
-import { Math as _Math } from "./math.ts";
+import { Math as _Math } from "./namespaces/math.ts";
-import { Set, WeakSet } from "./set.ts";
+import { Set, WeakSet } from "./classes/set.ts";
-import { JSON } from "./json.ts";
+import { JSON } from "./namespaces/json.ts";
-import { console } from "./console.ts";
+import { console } from "./namespaces/console.ts";
 import { encodeURI, encodeURIComponent } from "./url.ts";
-import { Promise } from "./promise.ts";
+import { Promise } from "./classes/promise.ts";
+import { ArrayBuffer } from "./arrays/ArrayBuffer.ts";
+import { Uint8Array } from "./arrays/Uint8Array.ts";
+import { Int32Array } from "./arrays/Int32Array.ts";
+import { TypedArray } from "./arrays/TypedArray.ts";
 
 declare global {
 	function print(...args: any[]): void;
@@ -46,6 +50,11 @@ target.RangeError = RangeError;
 target.SyntaxError = SyntaxError;
 target.TypeError = TypeError;
 
+fixup(TypedArray);
+target.ArrayBuffer = fixup(ArrayBuffer);
+target.Uint8Array = Uint8Array;
+target.Int32Array = Int32Array;
+
 target.Map = fixup(Map);
 target.WeakMap = fixup(WeakMap);
 target.Set = fixup(Set);
@@ -56,7 +65,6 @@ target.Promise = fixup(Promise);
 target.Math = object.setPrototype(_Math, Object.prototype);
 target.JSON = object.setPrototype(JSON, Object.prototype);
 target.console = object.setPrototype(console, Object.prototype);
-target.TYPED_ARRAY_SUPPORT = false;
 
 target.parseInt = Number.parseInt;
 target.parseFloat = Number.parseFloat;
@@ -77,5 +85,7 @@ setGlobalPrototypes({
 	syntax: SyntaxError.prototype,
 	range: RangeError.prototype,
 	type: TypeError.prototype,
+	uint8: Uint8Array.prototype,
+	int32: Int32Array.prototype,
 	regex: RegExp,
 });

src/lib/libs/arrays/ArrayBuffer.ts

@@ -0,0 +1,30 @@
+import { buffer, type InternalBuffer, map, symbol } from "../primordials.ts";
+
+export const abs = new map(true);
+export const abKey: unique symbol = symbol.getSymbol("ArrayBuffer.impl") as any;
+
+export class ArrayBuffer {
+	public [abKey]!: InternalBuffer;
+
+	public get byteLength() {
+		return this[abKey].length;
+	}
+	public get byteOffset() {
+		return 0;
+	}
+
+	public constructor(val: unknown) {
+		if (buffer.isBuff(val)) this[abKey] = val;
+		else this[abKey] = buffer.buff(Number(val));
+	}
+}
+
+export function getAB(buff: InternalBuffer): ArrayBuffer {
+	let res = abs.get(buff);
+	if (res == null) {
+		res = new ArrayBuffer(buff);
+		abs.set(buff, res);
+	}
+
+	return res;
+}

src/lib/libs/arrays/Int32Array.ts

@@ -0,0 +1,25 @@
+import { buffer } from "../primordials.ts";
+import { abstractIgnore, TypedArray, typedArrayFuncs } from "./TypedArray.ts";
+
+const factory = buffer.int32;
+const funcs = typedArrayFuncs(4, factory);
+
+export class Int32Array extends TypedArray {
+	public subarray(this: number[], start?: number, end?: number) {
+		return funcs.subarray(this, start, end);
+	}
+	public slice(this: any[], start?: number, end?: number) {
+		return funcs.slice(this, start, end);
+	}
+	public map(this: any[], cb: (val: number, i: number, self: any) => number, self?: any) {
+		return funcs.map(this, cb, self);
+	}
+	public filter(this: any[], cb: (val: number, i: number, self: any) => boolean, self?: any) {
+		return funcs.filter(this, cb, self);
+	}
+
+	public constructor(obj: any, start?: number, end?: number) {
+		super(abstractIgnore);
+		return funcs.construct(obj, start, end) as any;
+	}
+}

src/lib/libs/arrays/TypedArray.ts

@@ -0,0 +1,220 @@
+import { buffer, func, type InternalBuffer, object, string, symbol } from "../primordials.ts";
+import { symbols, wrapI } from "../utils.ts";
+import { Error, TypeError } from "../values/errors.ts";
+import { abKey, ArrayBuffer, getAB } from "./ArrayBuffer.ts";
+
+export const abstractIgnore = symbol.getSymbol("TypedArray.abstractIgnore");
+
+export function typedArrayFuncs(perEl: number, constructor: (buff: InternalBuffer, start: number, end: number) => number[]) {
+	return {
+		map(self: number[], cb: (val: number, i: number, self: number[]) => number, fnSelf: any) {
+			const res = constructor(buffer.buff(self.length * perEl), 0, self.length);
+
+			for (let i = 0; i < self.length; i++) {
+				res[i] = func.invoke(cb, fnSelf, [self[i], i, self]);
+			}
+
+			return res;
+		},
+		filter(self: number[], cb: (val: number, i: number, self: number[]) => boolean, fnSelf: any) {
+			const bigger = constructor(buffer.buff(self.length * perEl), 0, self.length);
+			let j = 0;
+	
+			for (let i = 0; i < self.length; i++) {
+				if (func.invoke(cb, self, [self[i], i, fnSelf])) bigger[j++] = self[i];
+			}
+	
+			const res = constructor(buffer.buff(j * perEl), 0, j);
+			for (let i = 0; i < j; i++) res[i] = bigger[i];
+			return res;
+		},
+		slice(self: number[], start = 0, end = self.length) {
+			start = wrapI(start, self.length);
+			end = wrapI(end, self.length);
+	
+			if (end <= start) return constructor(buffer.buff(0), 0, 0);
+	
+			const res = constructor(buffer.buff((end - start) * perEl), 0, end - start);
+	
+			for (let i = 0; i < end - start; i++) {
+				res[i] = self[start + i];
+			}
+	
+			return res;
+		},
+		subarray(self: number[], start = 0, end = self.length) {
+			start = wrapI(start, self.length);
+			end = wrapI(end, self.length);
+	
+			if (end <= start) return constructor(buffer.buff(0), 0, 0);
+	
+			const offset = buffer.start(self);
+			return constructor(buffer.backer(self), offset + start, offset + end);
+		},
+		construct(self: ArrayBuffer | number[] | number | Iterable<number>, start?: number, end?: number) {
+			if (typeof self === "number") {
+				return constructor(buffer.buff(self * perEl), 0, self);
+			}
+			if (self instanceof ArrayBuffer) {
+				const internal = self[abKey];
+				if (start === undefined) start = 0;
+				if (end === undefined) end = (internal.length / perEl) | 0;
+				return constructor(internal, start, end);
+			}
+			if (symbols.iterator in self && typeof self[symbols.iterator] === "function") {
+				const arr: number[] = [];
+				let i = 0;
+				const gen: Iterator<number> = self[symbols.iterator]();
+	
+				for (let it = gen.next(); !it.done; it = gen.next()) {
+					arr[i++] = Number(it.value);
+				}
+	
+				const res = constructor(buffer.buff(i * perEl), 0, i);
+				for (let j = 0; j < i; j++) res[j] = arr[j];
+				return res;
+			}
+	
+			const res = constructor(buffer.buff((self as number[]).length * perEl), 0, (self as number[]).length);
+			for (let i = 0; i < (self as number[]).length; i++) res[i] = (self as number[])[i];
+			return res;
+		},
+		byteOffset(self: number[]) {
+			return buffer.start(self) * perEl;
+		},
+		byteLength(self: number[]) {
+			return (buffer.end(self) - buffer.start(self)) * perEl;
+		},
+	};
+}
+
+export class TypedArray {
+	public get buffer() {
+		return getAB(buffer.backer(this as any));
+	}
+	public get byteOffset(): number {
+		throw new Error("abstract");
+	}
+	public get byteLength(): number {
+		throw new Error("abstract");
+	}
+
+	public forEach(this: number[], cb: (val: number, i: number, self: this) => void, self?: any) {
+		for (let i = 0; i < this.length; i++) {
+			if (i in this) func.invoke(cb, self, [this[i], i, this]);
+		}
+	}
+	public join(this: number[], delim = ",") {
+		delim = String(delim);
+		const parts = [];
+		if (delim) {
+			for (let i = 0; i < this.length; i++) {
+				if (i) parts[parts.length] = delim;
+				parts[parts.length] = (i in this) ? String(this[i]) : "";
+			}
+		}
+		else {
+			for (let i = 0; i < this.length; i++) {
+				parts[i] = (i in this) ? String(this[i]) : "";
+			}
+		}
+
+		return string.stringBuild(parts);
+	}
+
+	public subarray(this: number[], start = 0, end = this.length) {
+		throw new Error("'slice' is an abstract method");
+	}
+
+	public slice(this: number[], start = 0, end = this.length) {
+		throw new Error("'slice' is an abstract method");
+	}
+
+	public map(this: number[], cb: (val: number, i: number, self: this) => number, self?: any) {
+		throw new Error("'map' is an abstract method");
+	}
+	public filter(this: number[], cb: (val: number, i: number, self: this) => boolean, self?: any) {
+		throw new Error("'filter' is an abstract method");
+	}
+	public reduce(this: number[], cb: (a: number, b: number, i: number, self: number[]) => number, initial?: number) {
+		let i = 0;
+		if (arguments.length <= 1) initial = this[i++];
+
+		for (; i < this.length; i++) {
+			initial = cb(initial!, this[i], i, this);
+		}
+
+		return initial;
+	}
+	public some(this: number[], cb: (val: number, i: number, self: number[]) => boolean, self?: any) {
+		for (let i = 0; i < this.length; i++) {
+			if (func.invoke(cb, self, [this[i], i, this])) return true;
+		}
+
+		return false;
+	}
+	public every(this: number[], cb: (val: number, i: number, self: number[]) => boolean, self?: any) {
+		for (let i = 0; i < this.length; i++) {
+			if (!func.invoke(cb, self, [this[i], i, this])) return false;
+		}
+
+		return true;
+	}
+	public find(this: number[], cb: (val: number, i: number, self: number[]) => boolean, self?: any) {
+		for (let i = 0; i < this.length; i++) {
+			if (func.invoke(cb, self, [this[i], i, this])) return this[i];
+		}
+
+		return undefined;
+	}
+	public indexOf(this: number[], val: number, start = 0) {
+		start |= 0;
+		if (start < 0) start = 0;
+		for (let i = start; i < this.length; i++) {
+			if (this[i] === val) return i;
+		}
+
+		return -1;
+	}
+	public lastIndexOf(this: number[], val: number, start = 0) {
+		start |= 0;
+		if (start < 0) start = 0;
+
+		for (let i = this.length - 1; i >= start; i--) {
+			if (this[i] === val) return i;
+		}
+
+		return -1;
+	}
+	public includes(this: number[], val: number) {
+		for (let i = 0; i < this.length; i++) {
+			if (this[i] === val) return i;
+		}
+
+		return false;
+	}
+
+	public sort(this: number[], cb?:  (a: number, b: number) => number) {
+		cb ||= (a, b) => a - b;
+
+		return object.sort(this, cb);
+	}
+	public reverse(this: number[]) {
+		const mid = this.length >> 1;
+		const end = this.length - 1;
+
+		for (let i = 0; i < mid; i++) {
+			const tmp = this[i];
+			this[i] = this[end - i];
+			this[end - i] = tmp;
+		}
+
+		return this;
+	}
+
+	public constructor(token?: typeof abstractIgnore) {
+		if (token !== abstractIgnore) {
+			throw new TypeError("TypedArray constructor can't be called");
+		}
+	}
+}

src/lib/libs/arrays/Uint8Array.ts

@@ -0,0 +1,32 @@
+import { buffer } from "../primordials.ts";
+import { abstractIgnore, TypedArray, typedArrayFuncs } from "./TypedArray.ts";
+
+const factory = buffer.uint8;
+const funcs = typedArrayFuncs(1, factory);
+
+export class Uint8Array extends TypedArray {
+	public override get byteOffset() {
+		return funcs.byteOffset(this as any);
+	}
+	public override get byteLength() {
+		return funcs.byteLength(this as any);
+	}
+
+	public override subarray(this: number[], start?: number, end?: number) {
+		return funcs.subarray(this, start, end);
+	}
+	public override slice(this: any[], start?: number, end?: number) {
+		return funcs.slice(this, start, end);
+	}
+	public override map(this: any[], cb: (val: number, i: number, self: any) => number, self?: any) {
+		return funcs.map(this, cb, self);
+	}
+	public override filter(this: any[], cb: (val: number, i: number, self: any) => boolean, self?: any) {
+		return funcs.filter(this, cb, self);
+	}
+
+	public constructor(obj: any, start?: number, end?: number) {
+		super(abstractIgnore);
+		return funcs.construct(obj, start, end) as any;
+	}
+}

src/lib/libs/primordials.ts

@@ -1,3 +1,10 @@
+const buffSymbol: unique symbol = undefined as any;
+
+export interface InternalBuffer {
+	length: number;
+	[buffSymbol]: "buffer";
+}
+
 export interface SymbolPrimordials {
 	makeSymbol(name: string): symbol;
 	getSymbol(name: string): symbol;
@@ -46,6 +53,22 @@ export interface ObjectPrimordials {
 	memcpy(src: any[], dst: any[], srcI: number, dstI: number, n: number): void;
 	sort(arr: any[], cb: Function): any[];
 }
+export interface BufferPrimordials {
+	buff(n: number): InternalBuffer;
+	backer(arr: number[]): InternalBuffer;
+	start(arr: number[]): number;
+	end(arr: number[]): number;
+
+	uint8(buff: InternalBuffer, start: number, end: number): number[];
+	int8(buff: InternalBuffer, start: number, end: number): number[];
+	int32(buff: InternalBuffer, start: number, end: number): number[];
+
+	isUint8(val: any): val is number[];
+	isInt8(val: any): val is number[];
+	isInt32(val: any): val is number[];
+	is(val: any): val is number[];
+	isBuff(val: any): val is InternalBuffer;
+}
 export interface FunctionPrimordials {
 	invokeType(args: IArguments, self: any): "new" | "call";
 	invokeTypeInfer(): "new" | "call";
@@ -67,6 +90,7 @@ export interface Primordials {
 	object: ObjectPrimordials;
 	function: FunctionPrimordials;
 	json: JSONPrimordials;
+	buffer: BufferPrimordials;
 	map: new (weak?: boolean) => {
 		get(key: any): any;
 		has(key: any): boolean;
@@ -97,6 +121,7 @@ export const {
 	number,
 	string,
 	object,
+	buffer,
 	function: func,
 	json,
 	map,

src/main/java/me/topchetoeu/jscript/repl/SimpleRepl.java

@@ -36,8 +36,13 @@ import me.topchetoeu.jscript.runtime.exceptions.EngineException;
 import me.topchetoeu.jscript.runtime.values.Value;
 import me.topchetoeu.jscript.runtime.values.functions.FunctionValue;
 import me.topchetoeu.jscript.runtime.values.functions.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.objects.ArrayLikeValue;
 import me.topchetoeu.jscript.runtime.values.objects.ArrayValue;
 import me.topchetoeu.jscript.runtime.values.objects.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.objects.buffers.Int32ArrayValue;
+import me.topchetoeu.jscript.runtime.values.objects.buffers.Int8ArrayValue;
+import me.topchetoeu.jscript.runtime.values.objects.buffers.TypedArrayValue;
+import me.topchetoeu.jscript.runtime.values.objects.buffers.Uint8ArrayValue;
 import me.topchetoeu.jscript.runtime.values.primitives.BoolValue;
 import me.topchetoeu.jscript.runtime.values.primitives.StringValue;
 import me.topchetoeu.jscript.runtime.values.primitives.SymbolValue;
@@ -61,9 +66,12 @@ public class SimpleRepl {
 
 	private static void reader() {
 		try {
-			environment = createESEnv();
+			try {
-			tsEnvironment = createESEnv();
+				environment = createESEnv();
-
+				tsEnvironment = createESEnv();
+			}
+			catch (ExecutionException e) { throw e.getCause(); }
+			
 			server = new DebugServer();
 			debugTask = server.start(new InetSocketAddress("127.0.0.1", 9229), true);
 			server.targets.put("default", (socket, req) -> new SimpleDebugger(socket)
@@ -74,16 +82,19 @@ public class SimpleRepl {
 			try {
 				try { initGlobals(); } catch (ExecutionException e) { throw e.getCause(); }
 			}
-			catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
+			catch (EngineException | SyntaxException e) {
+				System.err.println("Failed to load stdlib. Falling back to barebones environment...");
+				System.err.println(Value.errorToReadable(environment, e, null));
+			}
 
 
 			System.out.println(String.format("Running %s v%s by %s", Metadata.name(), Metadata.version(), Metadata.author()));
 
 			for (var arg : args) {
-				try {
+				var file = new File(arg);
-					var file = new File(arg);
+				var raw = Reading.streamToString(new FileInputStream(file));
-					var raw = Reading.streamToString(new FileInputStream(file));
 
+				try {
 					try {
 						var res = engine.pushMsg(
 							false, environment,
@@ -95,14 +106,15 @@ public class SimpleRepl {
 					catch (ExecutionException e) { throw e.getCause(); }
 				}
 				catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
+
 			}
 
 			for (var i = 0; ; i++) {
+				var raw = Reading.readline();
+
+				if (raw == null) break;
+
 				try {
-					var raw = Reading.readline();
-
-					if (raw == null) break;
-
 					try {
 						var res = engine.pushMsg(
 							false, environment,
@@ -114,8 +126,10 @@ public class SimpleRepl {
 					catch (ExecutionException e) { throw e.getCause(); }
 				}
 				catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
+
 			}
 		}
+		catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
 		catch (IOException e) {
 			System.out.println(e.toString());
 			engine.thread().interrupt();
@@ -183,34 +197,78 @@ public class SimpleRepl {
 
 		var source = new StringBuilder();
 
-		var inBrackets = false;
+		StringBuilder bracesSource = null;
+		StringBuilder bracketsSource = null;
 
 		while (true) {
 			if (n >= src.length()) break;
 			var c = src.charAt(n++);
 
-			if (c == '\\') {
+			if (c == '\\' && n + 1 < src.length() && src.charAt(n) == 'b') {
+				c = '\b';
+				n++;
+			}
+
+			if (bracesSource != null) {
+				var failed = true;
+
+				if (Character.isDigit(c)) {
+					bracesSource.append(c);
+					failed = false;
+				}
+				else if (c == ',' && bracesSource.indexOf(",") < 0) {
+					bracesSource.append(c);
+					failed = false;
+				}
+				else if (c == '}' && bracesSource.length() > 0) {
+					bracesSource.append(c);
+					source.append(bracesSource);
+					bracesSource = null;
+					continue;
+				}
+
+				if (failed) {
+					source.append("\\");
+					source.append(bracesSource);
+					bracesSource = null;
+					n--;
+				}
+			}
+			else if (bracketsSource != null) {
+				if (c == '[') bracketsSource.append("\\[");
+				else if (c == ']') {
+					var res = bracketsSource.append(']').toString();
+					bracketsSource = null;
+					if (res.equals("[^]")) res = "[\\s\\S]";
+						else if (res.equals("[]")) res = "[^\\s\\S]";
+					source.append(res);
+				}
+				else if (c == '\\') {
+					if (n >= src.length()) break;
+					bracketsSource.append(c).append(src.charAt(n++));
+				}
+				else bracketsSource.append(c);
+			}
+			else if (c == '\\') {
 				if (n >= src.length()) throw new PatternSyntaxException("Unexpected end", src, n);
 				c = src.charAt(n++);
 				source.append('\\').append(c);
 			}
 			else if (c == '[') {
-				if (inBrackets) source.append("\\[");
+				bracketsSource = new StringBuilder("[");
-				else {
-					inBrackets = true;
-					source.append('[');
-				}
 			}
-			else if (c == ']') {
+			else if (c == '{' && bracketsSource == null) {
-				if (inBrackets) {
+				bracesSource = new StringBuilder("{");
-					inBrackets = false;
-					source.append(']');
-				}
-				else throw new PatternSyntaxException("Unexpected ']'", src, n);
 			}
 			else source.append(c);
 		}
 
+		if (bracesSource != null) {
+			source.append("\\");
+			source.append(bracesSource);
+		}
+		if (bracketsSource != null) throw new PatternSyntaxException("Unmatched '['", src, n - bracketsSource.length());
+
 		return source.toString();
 	}
 
@@ -314,12 +372,18 @@ public class SimpleRepl {
 			else return NumberValue.parseFloat(args.get(0).toString(), false);
 		}));
 		res.defineOwnField(env, "isNaN", new NativeFunction(args -> BoolValue.of(args.get(0).isNaN())));
-		res.defineOwnField(env, "NaN", NumberValue.NAN);
-		res.defineOwnField(env, "Infinity", NumberValue.of(Double.POSITIVE_INFINITY));
 
 		res.defineOwnField(env, "pow", new NativeFunction(args -> {
 			return NumberValue.of(Math.pow(args.get(0).toNumber(args.env).getDouble(), args.get(1).toNumber(args.env).getDouble()));
 		}));
+		res.defineOwnField(env, "log", new NativeFunction(args -> {
+			return NumberValue.of(Math.log(args.get(0).toNumber(args.env).getDouble()));
+		}));
+
+		res.defineOwnField(env, "NaN", NumberValue.NAN);
+		res.defineOwnField(env, "Infinity", NumberValue.of(Double.POSITIVE_INFINITY));
+		res.defineOwnField(env, "PI", NumberValue.of(Math.PI));
+		res.defineOwnField(env, "E", NumberValue.of(Math.E));
 
 		return res;
 	}
@@ -462,9 +526,6 @@ public class SimpleRepl {
 			if (member == null) return Value.UNDEFINED;
 			else return member.descriptor(args.env, obj);
 		}));
-		res.defineOwnField(env, "isArray", new NativeFunction(args -> {
-			return BoolValue.of(args.get(0) instanceof ArrayValue);
-		}));
 		res.defineOwnField(env, "preventExt", new NativeFunction(args -> {
 			args.get(0).preventExtensions();
 			return VoidValue.UNDEFINED;
@@ -499,6 +560,73 @@ public class SimpleRepl {
 			return arr;
 		}));
 
+		res.defineOwnField(env, "isArray", new NativeFunction(args -> {
+			return BoolValue.of(args.get(0) instanceof ArrayLikeValue);
+		}));
+
+		return res;
+	}
+
+	private static ObjectValue bufferPrimordials(Environment env) {
+		var buffProto = new ObjectValue();
+		buffProto.defineOwnProperty(env, "length", Optional.of(new NativeFunction(args -> {
+			return NumberValue.of(args.self(byte[].class).length);
+		})), Optional.empty(), false, true);
+
+		var res = new ObjectValue();
+		res.setPrototype(null, null);
+
+		res.defineOwnField(env, "buff", new NativeFunction(args -> {
+			var size = args.get(0).toNumber(env).getInt();
+			return TypedArrayValue.buffer(new byte[size], buffProto);
+		}));
+
+		res.defineOwnField(env, "uint8", new NativeFunction(args -> {
+			var buff = args.get(byte[].class, 0);
+			var start = args.get(1).toNumber(env).getInt();
+			var end = args.get(2).toNumber(env).getInt();
+			return new Uint8ArrayValue(buff, start, end);
+		}));
+		res.defineOwnField(env, "int8", new NativeFunction(args -> {
+			var buff = args.get(byte[].class, 0);
+			var start = args.get(1).toNumber(env).getInt();
+			var end = args.get(2).toNumber(env).getInt();
+			return new Int8ArrayValue(buff, start, end);
+		}));
+		res.defineOwnField(env, "int32", new NativeFunction(args -> {
+			var buff = args.get(byte[].class, 0);
+			var start = args.get(1).toNumber(env).getInt();
+			var end = args.get(2).toNumber(env).getInt();
+			return new Int32ArrayValue(buff, start, end);
+		}));
+
+		res.defineOwnField(env, "isUint8", new NativeFunction(args -> {
+			return BoolValue.of(args.get(0) instanceof Uint8ArrayValue);
+		}));
+		res.defineOwnField(env, "isInt8", new NativeFunction(args -> {
+			return BoolValue.of(args.get(0) instanceof Int8ArrayValue);
+		}));
+		res.defineOwnField(env, "isInt32", new NativeFunction(args -> {
+			return BoolValue.of(args.get(0) instanceof Int32ArrayValue);
+		}));
+
+		res.defineOwnField(env, "is", new NativeFunction(args -> {
+			return BoolValue.of(args.get(0) instanceof TypedArrayValue);
+		}));
+		res.defineOwnField(env, "isBuff", new NativeFunction(args -> {
+			return BoolValue.of(args.get(byte[].class, 0) != null);
+		}));
+
+		res.defineOwnField(env, "backer", new NativeFunction(args -> {
+			return TypedArrayValue.buffer(((TypedArrayValue)args.get(0)).buffer, buffProto);
+		}));
+		res.defineOwnField(env, "start", new NativeFunction(args -> {
+			return NumberValue.of(((TypedArrayValue)args.get(0)).start);
+		}));
+		res.defineOwnField(env, "end", new NativeFunction(args -> {
+			return NumberValue.of(((TypedArrayValue)args.get(0)).end);
+		}));
+
 		return res;
 	}
 
@@ -584,6 +712,7 @@ public class SimpleRepl {
 		res.defineOwnField(env, "number", numberPrimordials(env));
 		res.defineOwnField(env, "string", stringPrimordials(env));
 		res.defineOwnField(env, "object", objectPrimordials(env));
+		res.defineOwnField(env, "buffer", bufferPrimordials(env));
 		res.defineOwnField(env, "function", functionPrimordials(env));
 		res.defineOwnField(env, "json", jsonPrimordials(env));
 		res.defineOwnField(env, "map", mapPrimordials(env));
@@ -605,6 +734,8 @@ public class SimpleRepl {
 			setProto(args.env, env, Value.SYNTAX_ERR_PROTO, obj, "syntax");
 			setProto(args.env, env, Value.TYPE_ERR_PROTO, obj, "type");
 			setProto(args.env, env, Value.RANGE_ERR_PROTO, obj, "range");
+			setProto(args.env, env, Value.UINT8_ARR_PROTO, obj, "uint8");
+			setProto(args.env, env, Value.INT32_ARR_PROTO, obj, "int32");
 			var val = obj.getMember(args.env, "regex");
 			if (val instanceof FunctionValue func) {
 				env.add(Value.REGEX_CONSTR, func);
@@ -740,7 +871,7 @@ public class SimpleRepl {
 		reader.setName("STD Reader");
 		reader.start();
 
-		engine.thread().join();
+		reader.join();
 		engineTask.interrupt();
 		debugTask.interrupt();
 	}

src/main/java/me/topchetoeu/jscript/runtime/values/Value.java

@@ -62,7 +62,10 @@ public abstract class Value {
 	public static final Key<ObjectValue> FUNCTION_PROTO = new Key<>();
 
 	public static final Key<ObjectValue> ARRAY_PROTO = new Key<>();
-	public static final Key<ObjectValue> BYTE_BUFF_PROTO = new Key<>();
+
+	public static final Key<ObjectValue> INT8_ARR_PROTO = new Key<>();
+	public static final Key<ObjectValue> INT32_ARR_PROTO = new Key<>();
+	public static final Key<ObjectValue> UINT8_ARR_PROTO = new Key<>();
 
 	public static final Key<ObjectValue> ERROR_PROTO = new Key<>();
 	public static final Key<ObjectValue> SYNTAX_ERR_PROTO = new Key<>();

src/main/java/me/topchetoeu/jscript/runtime/values/objects/ByteBufferValue.java

@@ -1,81 +0,0 @@
-package me.topchetoeu.jscript.runtime.values.objects;
-
-import java.util.Arrays;
-import java.util.Iterator;
-
-import me.topchetoeu.jscript.common.environment.Environment;
-import me.topchetoeu.jscript.runtime.values.Value;
-import me.topchetoeu.jscript.runtime.values.primitives.numbers.NumberValue;
-
-public class ByteBufferValue extends ArrayLikeValue implements Iterable<Value> {
-	public final byte[] values;
-
-	public int size() { return values.length; }
-	public boolean setSize(int val) { return false; }
-
-	@Override public Value get(int i) {
-		if (i < 0 || i >= values.length) return null;
-		return NumberValue.of(values[i]);
-	}
-	@Override public boolean set(Environment env, int i, Value val) {
-		if (i < 0 || i >= values.length) return false;
-		values[i] = (byte)val.toNumber(env).getInt();
-		return true;
-	}
-	@Override public boolean has(int i) {
-		return i >= 0 && i < values.length;
-	}
-	@Override public boolean remove(int i) {
-		return false;
-	}
-
-	public void copyTo(byte[] arr, int sourceStart, int destStart, int count) {
-		System.arraycopy(values, sourceStart, arr, destStart, count);
-	}
-	public void copyTo(ByteBufferValue arr, int sourceStart, int destStart, int count) {
-		arr.copyFrom(values, sourceStart, destStart, count);
-	}
-	public void copyFrom(byte[] arr, int sourceStart, int destStart, int count) {
-		System.arraycopy(arr, sourceStart, arr, destStart, count);
-	}
-
-	public void move(int srcI, int dstI, int n) {
-		System.arraycopy(values, srcI, values, dstI, n);
-	}
-
-	public void sort() {
-		var buckets = new int[256];
-
-		for (var i = 0; i < values.length; i++) {
-			buckets[values[i] + 128]++;
-		}
-
-		var offset = 0;
-
-		for (var i = 0; i < values.length; i++) {
-			Arrays.fill(values, offset, offset += buckets[i], (byte)(i - 128));
-		}
-	}
-
-	@Override public Iterator<Value> iterator() {
-		return new Iterator<>() {
-			private int i = 0;
-
-			@Override public boolean hasNext() {
-				return i < size();
-			}
-			@Override public Value next() {
-				if (!hasNext()) return null;
-				return get(i++);
-			}
-		};
-	}
-
-	public ByteBufferValue(int size) {
-		this(new byte[size]);
-	}
-	public ByteBufferValue(byte[] buffer) {
-		setPrototype(BYTE_BUFF_PROTO);
-		this.values = buffer;
-	}
-}

src/main/java/me/topchetoeu/jscript/runtime/values/objects/buffers/Int32ArrayValue.java

@@ -0,0 +1,25 @@
+package me.topchetoeu.jscript.runtime.values.objects.buffers;
+
+public final class Int32ArrayValue extends TypedArrayValue {
+	@Override protected int onGet(int i) {
+		i = (i + start) << 2;
+		return (
+			this.buffer[i] |
+			this.buffer[i + 1] << 8 |
+			this.buffer[i + 2] << 16 |
+			this.buffer[i + 3] << 24
+		);
+	}
+	@Override protected void onSet(int i, int val) {
+		i = (i + start) << 2;
+		this.buffer[i + start + 0] = (byte)(val & 0xFF);
+		this.buffer[i + start + 1] = (byte)(val >> 8 & 0xFF);
+		this.buffer[i + start + 2] = (byte)(val >> 16 & 0xFF);
+		this.buffer[i + start + 3] = (byte)(val >> 24 & 0xFF);
+	}
+
+	public Int32ArrayValue(byte[] buff, int start, int end) {
+		super(buff, 4, start, end);
+		setPrototype(INT32_ARR_PROTO);
+	}
+}

src/main/java/me/topchetoeu/jscript/runtime/values/objects/buffers/Int8ArrayValue.java

@@ -0,0 +1,15 @@
+package me.topchetoeu.jscript.runtime.values.objects.buffers;
+
+public final class Int8ArrayValue extends TypedArrayValue {
+	@Override protected int onGet(int i) {
+		return this.buffer[i + start];
+	}
+	@Override protected void onSet(int i, int val) {
+		this.buffer[i + start] = (byte)val;
+	}
+
+	public Int8ArrayValue(byte[] buff, int start, int end) {
+		super(buff, 1, start, end);
+		setPrototype(INT8_ARR_PROTO);
+	}
+}

src/main/java/me/topchetoeu/jscript/runtime/values/objects/buffers/TypedArrayValue.java

@@ -0,0 +1,60 @@
+package me.topchetoeu.jscript.runtime.values.objects.buffers;
+
+import java.util.WeakHashMap;
+
+import me.topchetoeu.jscript.common.environment.Environment;
+import me.topchetoeu.jscript.runtime.values.Value;
+import me.topchetoeu.jscript.runtime.values.objects.ArrayLikeValue;
+import me.topchetoeu.jscript.runtime.values.objects.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.primitives.UserValue;
+import me.topchetoeu.jscript.runtime.values.primitives.numbers.NumberValue;
+
+public abstract class TypedArrayValue extends ArrayLikeValue {
+	public static final WeakHashMap<byte[], UserValue<byte[]>> userValues = new WeakHashMap<>();
+
+	public final byte[] buffer;
+	public final int elementSize;
+	public final int start;
+	public final int end;
+
+	protected abstract int onGet(int i);
+	protected abstract void onSet(int i, int val);
+
+	@Override public int size() {
+		return end - start;
+	}
+
+	@Override public boolean setSize(int val) {
+		return false;
+	}
+
+	@Override public Value get(int i) {
+		if (i < 0 || i >= size()) return null;
+		return NumberValue.of(onGet(i));
+	}
+	@Override public boolean set(Environment env, int i, Value val) {
+		if (i < 0 || i >= size()) return false;
+		onSet(i, val.toNumber(env).getInt());
+		return true;
+	}
+	@Override public boolean has(int i) {
+		return i >= 0 && i < size();
+	}
+	@Override public boolean remove(int i) {
+		return false;
+	}
+
+	public TypedArrayValue(byte[] buffer, int elementSize, int start, int end) {
+		this.buffer = buffer;
+		this.elementSize = elementSize;
+		this.start = start;
+		this.end = end;
+	}
+
+	public static UserValue<byte[]> buffer(byte[] buff, ObjectValue proto) {
+		if (userValues.containsKey(buff)) return userValues.get(buff);
+		var res = UserValue.of(buff, proto);
+		userValues.put(buff, res);
+		return res;
+	}
+}

src/main/java/me/topchetoeu/jscript/runtime/values/objects/buffers/Uint8ArrayValue.java

@@ -0,0 +1,19 @@
+package me.topchetoeu.jscript.runtime.values.objects.buffers;
+
+public final class Uint8ArrayValue extends TypedArrayValue {
+	@Override protected int onGet(int i) {
+		var res = this.buffer[i + start];
+		if (res < 0) res += 0x100;
+
+		return res;
+	}
+	@Override protected void onSet(int i, int val) {
+		if (val > 0x7F) val -= 0x100;
+		this.buffer[i + start] = (byte)val;
+	}
+
+	public Uint8ArrayValue(byte[] buff, int start, int end) {
+		super(buff, 1, start, end);
+		setPrototype(UINT8_ARR_PROTO);
+	}
+}