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50 lines
1.5 KiB
TypeScript
50 lines
1.5 KiB
TypeScript
/**
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* Copyright (c) OpenLens Authors. All rights reserved.
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* Licensed under MIT License. See LICENSE in root directory for more information.
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*/
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/**
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* A inference typed version of `Array(length).fill(value)`
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* @param length The number of entries
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* @param value The value of each of the indices
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*/
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export function filled<T>(length: number, value: T): T[] {
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return Array(length).fill(value);
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}
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/**
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* This function splits an array into two sub arrays on the first instance of
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* element (from the left). If the array does not contain the element. The
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* return value is defined to be `[array, [], false]`. If the element is in
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* the array then the return value is `[left, right, true]` where `left` is
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* the elements of `array` from `[0, index)` and `right` is `(index, length)`
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* @param array the full array to split into two sub-arrays
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* @param element the element in the middle of the array
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* @returns the left and right sub-arrays which when conjoined with `element`
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* is the same as `array`, and `true`
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*/
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export function split<T>(src: T[], element: T): [T[], T[], boolean] {
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const index = src.indexOf(element);
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if (index < 0) {
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return [src, [], false];
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}
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return [src.slice(0, index), src.slice(index + 1, src.length), true];
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}
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export function bifurcate<T>(src: T[], condition: (item: T) => any): [falses: T[], trues: T[]] {
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const trues: T[] = [];
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const falses: T[] = [];
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for (const item of src) {
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if (condition(item)) {
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trues.push(item);
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} else {
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falses.push(item);
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}
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}
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return [falses, trues];
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}
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