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ArrayReduce.ts
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28 lines (24 loc) · 772 Bytes
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// https://www.ecma-international.org/ecma-262/9.0/index.html#sec-array.prototype.reduce
function __TS__ArrayReduce<T>(
this: void,
arr: T[],
callbackFn: (accumulator: T, currentValue: T, index: number, array: T[]) => T,
...initial: T[]
): T {
const len = arr.length;
let k = 0;
let accumulator = undefined;
// Check if initial value is present in function call
if (select("#", ...initial) !== 0) {
accumulator = select(1, ...initial);
} else if (len > 0) {
accumulator = arr[0];
k = 1;
} else {
throw "Reduce of empty array with no initial value";
}
for (const i of $range(k, len - 1)) {
accumulator = callbackFn(accumulator, arr[i], i, arr);
}
return accumulator;
}