30-seconds-of-code/snippets/aperture.md

title, tags, firstSeen, lastUpdated

title	tags	firstSeen	lastUpdated
aperture	array,intermediate	2020-05-13T13:25:33+03:00	2020-10-18T20:24:28+03:00

Creates an array of n-tuples of consecutive elements.

• Use Array.prototype.slice() and Array.prototype.map() to create an array of appropriate length.
• Populate the array with n-tuples of consecutive elements from arr.
• If n is greater than the length of arr, return an empty array.

const aperture = (n, arr) =>
  n > arr.length
    ? []
    : arr.slice(n - 1).map((v, i) => arr.slice(i, i + n));

aperture(2, [1, 2, 3, 4]); // [[1, 2], [2, 3], [3, 4]]
aperture(3, [1, 2, 3, 4]); // [[1, 2, 3], [2, 3, 4]]
aperture(5, [1, 2, 3, 4]); // []