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ArrayFlatMap.ts

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export function __TS__ArrayFlatMap<T, U>(

this: T[],

callback: (value: T, index: number, array: T[]) => U | readonly U[],

thisArg?: any

): U[] {

const result: U[] = [];

let len = 0;

for (const i of $range(1, this.length)) {

const value = callback.call(thisArg, this[i - 1], i - 1, this);

if (Array.isArray(value)) {

for (const j of $range(1, value.length)) {

len++;

result[len - 1] = value[j - 1];

}

} else {

len++;

result[len - 1] = value as U;

}

return result;

}