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43 lines
1.5 KiB
TypeScript
43 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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* 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 splitArray<T>(array: T[], element: T): [T[], T[], boolean] {
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const index = array.indexOf(element);
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if (index < 0) {
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return [array, [], false];
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}
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return [array.slice(0, index), array.slice(index + 1, array.length), true];
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}
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/**
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* Splits an array into two parts based on the outcome of `condition`. If `true`
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* the value will be returned as part of the right array. If `false` then part of
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* the left array.
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* @param src the full array to bifurcate
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* @param condition the function to determine which set each is in
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*/
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export function bifurcateArray<T>(src: T[], condition: (item: T) => boolean): [falses: T[], trues: T[]] {
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const res: [T[], T[]] = [[], []];
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for (const item of src) {
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res[+condition(item)].push(item);
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}
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return res;
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}
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