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# prefer-boolean-length-check
Prefers using a boolean length check rather than comparing against zero.
## Examples of incorrect code for this rule
```js
if (foo.length == 0) {}
if (foo.length > 0) {}
if (foo && foo.length == 0) {}
function bar() { return foo.length > 0 }
```
## Examples of correct code for this rule
```js
if (foo.length && foo.length) {}
if (!foo.length) {}
var a = foo.length > 0
function bar() { return !!foo.length }
```