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use-includes-instead-of-indexOf
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Use ``.includes`` instead of ``.indexOf`` to check if something is in an array
or string.
Examples of incorrect code for this rule:
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.. code-block:: js
let a = foo.indexOf(bar) >= 0;
let a = foo.indexOf(bar) == -1;
Examples of correct code for this rule:
---------------------------------------
.. code-block:: js
let a = foo.includes(bar);
let a = foo.indexOf(bar) > 0;