Kebab file names

snippets/initialize-array-with-range-right.md

@@ -0,0 +1,27 @@
+---
+title: Initialize array with reversed range
+tags: array
+cover: interior-4
+firstSeen: 2018-01-16T17:09:39+02:00
+lastUpdated: 2020-10-20T23:02:01+03:00
+---
+
+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()` to create an array of the desired length, `(end - start + 1) / step`.
+- Use `Array.prototype.map()` 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 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
+  );
+```
+
+```js
+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]
+```