33 lines
1 KiB
TypeScript
33 lines
1 KiB
TypeScript
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type TypedArray = Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array | BigInt64Array | BigUint64Array
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export const at = {
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at<T extends Array<any> | string | TypedArray>(this: T, index: number) {
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index = Math.trunc(index) || 0
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if (index < 0) index += this.length;
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if (index < 0 || index >= this.length) return undefined;
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return this[index];
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}
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}.at
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export const initRelativeIndexingMethod = (target: any, exclude: Set<string>) => {
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if (exclude.has('at')) return
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const Classes = []
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if (!exclude.has('TypedArray')) Classes.push(Object.getPrototypeOf(target.Int8Array || globalThis.Int8Array))
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if (!exclude.has('Array')) Classes.push(target.Array || globalThis.Array)
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if (!exclude.has('String')) Classes.push(target.String || globalThis.String)
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for (const Class of Classes) {
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if (!Class.prototype.at) Object.defineProperty(Class.prototype, 'at', {
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value: at,
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writable: true,
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enumerable: false,
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configurable: true
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})
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}
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}
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