Add decimal to hex

blog_posts/js-decimal-to-hex.md

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+---
+title: "Tip: Convert decimal number to hexadecimal"
+shortTitle: Decimal to hexadecimal
+type: tip
+tags: javascript,math
+expertise: beginner
+author: chalarangelo
+cover: blog_images/waves-from-above.jpg
+excerpt: Ever needed to convert a decimal number to hexadecimal? Here's a quick and easy way to do it.
+firstSeen: 2022-09-21T05:00:00-04:00
+---
+
+Numeric values are represented in decimal format by default, when converted to strings. If you want to display them in hexadecimal format, you can use `Number.prototype.toString()` and pass the base you want to use (`16`) as an argument.
+
+```js
+const decimalToHex = dec => dec.toString(16);
+
+decimalToHex(0); // '0'
+decimalToHex(255); // 'ff'
+```
+
+Conversely, the opposite might also be needed. You can use `parseInt()` to convert a string to a number in a given base. If you don't specify a base, it will default to `10`.
+
+```js
+const hexToDecimal = hex => parseInt(hex, 16);
+
+hexToDecimal('0'); // 0
+hexToDecimal('ff'); // 255
+```