29 lines
946 B
Markdown
29 lines
946 B
Markdown
---
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title: "Tip: Convert decimal number to hexadecimal"
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shortTitle: Decimal to hexadecimal
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type: tip
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tags: javascript,math
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author: chalarangelo
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cover: waves-from-above
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excerpt: Ever needed to convert a decimal number to hexadecimal? Here's a quick and easy way to do it.
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firstSeen: 2022-09-21T05:00:00-04:00
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---
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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.
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```js
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const decimalToHex = dec => dec.toString(16);
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decimalToHex(0); // '0'
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decimalToHex(255); // 'ff'
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```
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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`.
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```js
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const hexToDecimal = hex => parseInt(hex, 16);
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hexToDecimal('0'); // 0
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hexToDecimal('ff'); // 255
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```
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