[pve-eslint.git] / eslint / docs / rules / no-negated-condition.md

# disallow negated conditions (no-negated-condition)

Negated conditions are more difficult to understand. Code can be made more readable by inverting the condition instead.

## Rule Details

This rule disallows negated conditions in either of the following:

* `if` statements which have an `else` branch
* ternary expressions

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

```js
/*eslint no-negated-condition: "error"*/

if (!a) {
    doSomething();
} else {
    doSomethingElse();
}

if (a != b) {
    doSomething();
} else {
    doSomethingElse();
}

if (a !== b) {
    doSomething();
} else {
    doSomethingElse();
}

!a ? c : b
```

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

```js
/*eslint no-negated-condition: "error"*/

if (!a) {
    doSomething();
}

if (!a) {
    doSomething();
} else if (b) {
    doSomething();
}

if (a != b) {
    doSomething();
}

a ? b : c
```
Commit	Line	Data
eb39fafa DC	1	# disallow negated conditions (no-negated-condition)
	2
	3	Negated conditions are more difficult to understand. Code can be made more readable by inverting the condition instead.
	4
	5	## Rule Details
	6
	7	This rule disallows negated conditions in either of the following:
	8
	9	* `if` statements which have an `else` branch
	10	* ternary expressions
	11
	12	Examples of incorrect code for this rule:
	13
	14	```js
	15	/eslint no-negated-condition: "error"/
	16
	17	if (!a) {
	18	doSomething();
	19	} else {
	20	doSomethingElse();
	21	}
	22
	23	if (a != b) {
	24	doSomething();
	25	} else {
	26	doSomethingElse();
	27	}
	28
	29	if (a !== b) {
	30	doSomething();
	31	} else {
	32	doSomethingElse();
	33	}
	34
	35	!a ? c : b
	36	```
	37
	38	Examples of correct code for this rule:
	39
	40	```js
	41	/eslint no-negated-condition: "error"/
	42
	43	if (!a) {
	44	doSomething();
	45	}
	46
	47	if (!a) {
	48	doSomething();
	49	} else if (b) {
	50	doSomething();
	51	}
	52
	53	if (a != b) {
	54	doSomething();
	55	}
	56
	57	a ? b : c
	58	```