indexOf :: Array |
Note: this uses the == equivalence operator, not the === strict equality operator. The bottom example below illustrates this.
Minor note: this uses a plain old optimized indexing loop, so there’s no risk of extensions being detected by this method.
Example
[3, 5, 6, 1, 20].indexOf(1) // -> 3
[3, 5, 6, 1, 20].indexOf(90) // -> -1
[0, false, 15].indexOf(false) // -> 0 instead of 1, because 0 == false!
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Prototype API 1.5.0 - prototypejs.org