How Can I Replicate Python's Zip Function in JavaScript?

Javascript Equivalents of Python's Zip Function

Python's zip function can be replicated in JavaScript using various approaches. Let's explore two common methods:

1. Array Mapping

This method assumes the input arrays are of equal length and involves mapping the first array to create pairs with corresponding elements from the other arrays.

function zip(...arrays) {
  return arrays[0].map((_, i) => arrays.map((array) => array[i]));
}

Example:

const array1 = [1, 2, 3];
const array2 = ['a', 'b', 'c'];
const array3 = [4, 5, 6];

const zippedArray = zip(array1, array2, array3);

console.log(zippedArray); // [[1, 'a', 4], [2, 'b', 5], [3, 'c', 6]]

2. Array.apply and Array Mapping

This method handles both equal and unequal length arrays, returning undefined for missing values.

function zip(...arrays) {
  const longest = arrays.reduce((a, b) => (a.length > b.length ? a : b), []);

  return Array.apply(null, Array(longest.length)).map((_, i) =>
    arrays.map((array) => array[i])
  );
}

Example:

const array1 = [1, 2, 3];
const array2 = ['a', 'b'];
const array3 = [4, 5, 6];

const zippedArray = zip(array1, array2, array3);

console.log(zippedArray); // [[1, 'a', 4], [2, 'b', 5], [3, undefined, 6]]

Note: If you're using any of the above methods with arrays of unequal length, keep in mind that they aren't their own inverse. To mimic Python's zip(*[...]) idiom, use zip.apply(this, [...]).

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