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

initializeArrayWithRange

Initializes an array containing the numbers in the specified range where start and end are inclusive with there common difference step.

Use Array(Math.ceil((end + 1) - start)/2) 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. You can omit step to use a default value of 1.

const initializeArrayWithRange = (end, start = 0,step = 1) =>
  Array(Math.ceil((end + 1 - start)/2)).fill(0).map((v, i) => (i * step) + start);

initializeArrayWithRange(5); // [0,1,2,3,4,5]
initializeArrayWithRange(7, 3); // [3,4,5,6,7]
initializeArrayWithRange(9,0,2); //[0,2,4,6,8]