---
title: initializeArrayWithRange
tags: array,intermediate
---

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

- Use `Array.from()` to create an array of the desired length.
- Use `(end - start + 1)/step` and a map function to fill the array with the desired values in the given 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`.

```js
const initializeArrayWithRange = (end, start = 0, step = 1) =>
  Array.from(
    { length: Math.ceil((end - start + 1) / step) },
    (_, i) => i * step + start
  );
```

```js
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]
```