# use-includes-instead-of-indexOf

Use `.includes` instead of `.indexOf` to check if something is in an array
or string.

## Examples of incorrect code for this rule

```js
let a = foo.indexOf(bar) >= 0;
let a = foo.indexOf(bar) == -1;
```

## Examples of correct code for this rule

```js
let a = foo.includes(bar);
let a = foo.indexOf(bar) > 0;
```