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sampleSize javascript Code Snippet in 2024

arrayrandomintermediate

Last Updated: 15 February 2024

Gets n random elements at unique keys from an array up to the size of the array.

  • Shuffle the array using the Fisher-Yates algorithm.
  • Use Array.prototype.slice() to get the first n elements.
  • Omit the second argument, n, to get only one element at random from the array.
const sampleSize = ([...arr], n = 1) => { let m = arr.length; while (m) { const i = Math.floor(Math.random() * m--); [arr[m], arr[i]] = [arr[i], arr[m]]; } return arr.slice(0, n); };
sampleSize([1, 2, 3], 2); // [3, 1] sampleSize([1, 2, 3], 4); // [2, 3, 1]

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