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Copy patharrayAt.js
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29 lines (27 loc) · 730 Bytes
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// From https://github.com/tc39/proposal-relative-indexing-method#polyfill
if (!Array.prototype.at) {
function at(n) {
// ToInteger() abstract op
n = Math.trunc(n) || 0
// Allow negative indexing from the end
if (n < 0) {
n += this.length
}
// OOB access is guaranteed to return undefined
if (n < 0 || n >= this.length) {
return undefined
}
// Otherwise, this is just normal property access
return this[n]
}
const TypedArray = Reflect.getPrototypeOf(Int8Array)
for (const C of [Array, String, TypedArray]) {
Object.defineProperty(C.prototype, 'at', {
value: at,
writable: true,
enumerable: false,
configurable: true,
})
}
}
export {}