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initializeArrayWithRangeRight javascript Code Snippet in 2022

arrayintermediate

Last Updated: 26 November 2022

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

  • Use Array.from(Math.ceil((end+1-start)/step)) to create an array of the desired length(the amounts of elements is equal to (end-start)/step or (end+1-start)/step for inclusive end), Array.prototype.map() to fill with the desired values in a range.
  • Omit the second argument, start, to use a default value of 0.
  • Omit the last argument, step, to use a default value of 1.
const initializeArrayWithRangeRight = (end, start = 0, step = 1) => Array.from({ length: Math.ceil((end + 1 - start) / step) }).map( (v, i, arr) => (arr.length - i - 1) * step + start );
initializeArrayWithRangeRight(5); // [5, 4, 3, 2, 1, 0] initializeArrayWithRangeRight(7, 3); // [7, 6, 5, 4, 3] initializeArrayWithRangeRight(9, 0, 2); // [8, 6, 4, 2, 0]

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