Start of main content###
Regular expression

###
Multiply by 1

###
Number.parseFloat

## Recommended snippets

JavaScript provides a couple of ways to format numeric values to a given precision. Namely, you can use `Number.prototype.toFixed()`

and `Number.prototype.toPrecision()`

to similar effect. However, neither of them deals with trailing zeros in the decimal part. Here's a few ways you can remove them:

Provided that the number is converted to a fixed-point string, you can use a regular expression to remove trailing zeros. All you have to do is match the decimal point (`\.`

) and replace any zeros after it (`0+`

) until the end of the string (`$`

).

```
const toFixedWithoutZeros = (num, precision) =>
num.toFixed(precision).replace(/\.0+$/, '');
toFixedWithoutZeros(1.001, 2); // '1'
toFixedWithoutZeros(1.500, 2); // '1.50'
```

The main issue with this approach is that the regular expression will only remove trailing zeros if the decimal part has no other digits before them. Writing a regular expression to remove trailing zeros from any number is a bit more involved and gets harder to read. Thus, this approach is discouraged.

A better way to remove trailing zeros is to multiply by `1`

. This method will remove trailing zeros from the decimal part of the number, accounting for non-zero digits after the decimal point. The only downside is that the result is a numeric value, so it has to be converted back to a string.

```
const toFixedWithoutZeros = (num, precision) =>
`${1 * num.toFixed(precision)}`;
toFixedWithoutZeros(1.001, 2); // '1'
toFixedWithoutZeros(1.500, 2); // '1.5'
```

Similar to the previous approach, you can use `Number.parseFloat()`

to remove trailing zeros from a number. This method also accounts for non-zero digits after the decimal point. We recommend this approach as it's the most readable.

```
const toFixedWithoutZeros = (num, precision) =>
`${Number.parseFloat(num.toFixed(precision))}`;
toFixedWithoutZeros(1.001, 2); // '1'
toFixedWithoutZeros(1.500, 2); // '1.5'
```

### Number to fixed-point notation without trailing zeros

JavaScript, Math

Formats a number using fixed-point notation, if it has decimals.

### Number to decimal mark

JavaScript, Math

Converts a number to a decimal mark formatted string.

### Number is negative zero

JavaScript, Math

Checks if the given value is equal to negative zero (

`-0`

).