arr-includes
Return positive value if (any of the) passed value(s) exists in array, or optionally an index
inarray
Curried predicate which checks that a value exists in an array. Generally faster than `indexOf` across JS engines.
in_array
The Javascript version of "in_array" php function from the php.js project - http://phpjs.org/
admit
admit/ban/check for array values like a proper bouncer