[pve-eslint.git] / eslint / docs / rules / no-floating-decimal.md

# Disallow Floating Decimals (no-floating-decimal)

Float values in JavaScript contain a decimal point, and there is no requirement that the decimal point be preceded or followed by a number. For example, the following are all valid JavaScript numbers:

```js
var num = .5;
var num = 2.;
var num = -.7;
```

Although not a syntax error, this format for numbers can make it difficult to distinguish between true decimal numbers and the dot operator. For this reason, some recommend that you should always include a number before and after a decimal point to make it clear the intent is to create a decimal number.

## Rule Details

This rule is aimed at eliminating floating decimal points and will warn whenever a numeric value has a decimal point but is missing a number either before or after it.

Examples of **incorrect** code for this rule:

```js
/*eslint no-floating-decimal: "error"*/

var num = .5;
var num = 2.;
var num = -.7;
```

Examples of **correct** code for this rule:

```js
/*eslint no-floating-decimal: "error"*/

var num = 0.5;
var num = 2.0;
var num = -0.7;
```

## When Not To Use It

If you aren't concerned about misinterpreting floating decimal point values, then you can safely turn this rule off.

## Compatibility

* **JSHint**: W008, W047
Commit	Line	Data
eb39fafa DC	1	# Disallow Floating Decimals (no-floating-decimal)
	2
	3	Float values in JavaScript contain a decimal point, and there is no requirement that the decimal point be preceded or followed by a number. For example, the following are all valid JavaScript numbers:
	4
	5	```js
	6	var num = .5;
	7	var num = 2.;
	8	var num = -.7;
	9	```
	10
	11	Although not a syntax error, this format for numbers can make it difficult to distinguish between true decimal numbers and the dot operator. For this reason, some recommend that you should always include a number before and after a decimal point to make it clear the intent is to create a decimal number.
	12
	13	## Rule Details
	14
	15	This rule is aimed at eliminating floating decimal points and will warn whenever a numeric value has a decimal point but is missing a number either before or after it.
	16
	17	Examples of incorrect code for this rule:
	18
	19	```js
	20	/eslint no-floating-decimal: "error"/
	21
	22	var num = .5;
	23	var num = 2.;
	24	var num = -.7;
	25	```
	26
	27	Examples of correct code for this rule:
	28
	29	```js
	30	/eslint no-floating-decimal: "error"/
	31
	32	var num = 0.5;
	33	var num = 2.0;
	34	var num = -0.7;
	35	```
	36
	37	## When Not To Use It
	38
	39	If you aren't concerned about misinterpreting floating decimal point values, then you can safely turn this rule off.
	40
	41	## Compatibility
	42
	43	* JSHint: W008, W047