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

initializeArrayWithRange

Initializes an array containing the numbers in the specified range where start and end are inclusive.

Use Array((end + 1) - start) to create an array of the desired length, Array.map() to fill with the desired values in a range. You can omit start to use a default value of 0.

const initializeArrayWithRange = (end, start = 0) =>
  Array.from({ length: end + 1 - start }).map((v, i) => i + start);

initializeArrayWithRange(5); // [0,1,2,3,4,5]
initializeArrayWithRange(7, 3); // [3,4,5,6,7]