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53 lines
1.5 KiB
Markdown
53 lines
1.5 KiB
Markdown
# Format A Decimal To A Fixed Number Of Digits
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The `Intl.NumberFormat` object is a reliable way to format numbers in an
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i18n-friendly way. It available with Node and all modern browsers.
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If I want to format number that I expect to contain decimals, I can do so by
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setting up a formatter using the `decimal` style.
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```javascript
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const locale = "en-US";
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const options = {
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style: "decimal",
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};
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const formatter = new Intl.NumberFormat(locale, options);
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console.log(formatter.format(1234))
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//=> 1,234
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console.log(formatter.format(1234.5678))
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//=> 1,234.568
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```
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Because of my locale (`en-US`), it adds a comma to deliniate the thousandth
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place. By default, it formats to three decimal places excluding decimals
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altogether if it is a whole number.
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If I want to specify a fixed number of decimal places including for a whole
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number, I can use the `minimumFractionDigits` and `maximumFractionDigits`
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options.
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```javascript
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const locale = "en-US";
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const options = {
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style: "decimal",
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minimumFractionDigits: 2,
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maximumFractionDigits: 2,
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};
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const formatter = new Intl.NumberFormat(locale, options);
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console.log(formatter.format(1234))
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//=> 1,234.00
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console.log(formatter.format(1234.5678))
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//=> 1,234.57
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```
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Here, it includes the `.00` on the whole number and it truncates the number
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with more than 2 decimal places rounding as necessary.
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See the [`Intl.NumberFormat`
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docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat/NumberFormat)
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for more details.
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