iteragain/dist/cjs/shuffle.js

Javascript Iterable/Iterator/Generator-function utilities.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.shuffle = shuffle;
const toArray_1 = require("./toArray");
/**
 * Collects all values from the input iterator, then shuffles the order of it's values.
 * @param seed A seed between 0 and 1.
 */
function shuffle(arg, seed = Math.random()) {
    const values = (0, toArray_1.default)(arg);
    for (let i = values.length - 1; i > 0; i--) {
        const j = Math.min(i, Math.max(0, Math.floor(seed * (i + 1))));
        [values[i], values[j]] = [values[j], values[i]];
    }
    return values[Symbol.iterator]();
}
exports.default = shuffle;
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