@lodestar/beacon-node/lib/util/shuffle.js

A Typescript implementation of the beacon chain

/**
 * Randomize an array of items without mutation.
 * Note: Uses Math.random() as entropy source, use for non-critical stuff
 */
export function shuffle(arr) {
    const _arr = [...arr];
    for (let i = arr.length - 1; i > 0; i--) {
        const j = Math.floor(Math.random() * (i + 1));
        [_arr[i], _arr[j]] = [_arr[j], _arr[i]];
    }
    return _arr;
}
/**
 * Return one random item from array
 */
export function shuffleOne(arr) {
    if (arr.length === 0)
        return undefined;
    return arr[Math.floor(Math.random() * arr.length)];
}
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