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javascript/snippets/reverse-number.md

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+---
+title: Reverse number
+type: snippet
+tags: [math,string]
+cover: walking
+dateModified: 2020-09-18T21:19:23+03:00
+---
+
+Reverses a number.
+
+- Use `Object.prototype.toString()` to convert `n` to a string.
+- Use `String.prototype.split()`, `Array.prototype.reverse()` and `Array.prototype.join()` to get the reversed value of `n` as a string.
+- Use `parseFloat()` to convert the string to a number and `Math.sign()` to preserve its sign.
+
+```js
+const reverseNumber = n =>
+  parseFloat(`${n}`.split('').reverse().join('')) * Math.sign(n);
+```
+
+```js
+reverseNumber(981); // 189
+reverseNumber(-500); // -5
+reverseNumber(73.6); // 6.37
+reverseNumber(-5.23); // -32.5
+```