34 lines
909 B
TypeScript
34 lines
909 B
TypeScript
// https://stackoverflow.com/a/2450976
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import { randFromArray } from "@lingdocs/pashto-inflector";
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function shuffleArray<T>(arr: Readonly<Array<T>>): Array<T> {
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let currentIndex = arr.length, temporaryValue, randomIndex;
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const array = [...arr];
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// While there remain elements to shuffle...
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while (0 !== currentIndex) {
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// Pick a remaining element...
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randomIndex = Math.floor(Math.random() * currentIndex);
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currentIndex -= 1;
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// And swap it with the current element.
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temporaryValue = array[currentIndex];
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array[currentIndex] = array[randomIndex];
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array[randomIndex] = temporaryValue;
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}
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return array;
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}
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export function maybeShuffleArray<T>(arr: Array<T>): Array<T> {
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const shuffle = randFromArray([true, false, true, false, false]);
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if (shuffle) {
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return shuffleArray(arr);
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}
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return arr;
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}
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export default shuffleArray; |