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zip javascript Code Snippet in 2024

arrayintermediate

Last Updated: 14 March 2024

Creates an array of elements, grouped based on their position in the original arrays.

  • Use Math.max(), Function.prototype.apply() to get the longest array in the arguments.
  • Create an array with that length as return value and use Array.from() with a mapping function to create an array of grouped elements.
  • If lengths of the argument arrays vary, undefined is used where no value could be found.
const zip = (...arrays) => { const maxLength = Math.max(...arrays.map(x => x.length)); return Array.from({ length: maxLength }).map((_, i) => { return Array.from({ length: arrays.length }, (_, k) => arrays[k][i]); }); };
zip(['a', 'b'], [1, 2], [true, false]); // [['a', 1, true], ['b', 2, false]] zip(['a'], [1, 2], [true, false]); // [['a', 1, true], [undefined, 2, false]]

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