Array API: array.findIndex()
Array.prototype.findIndex() find the index of an item in an array.
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Array.prototype.findIndex makes finding items in arrays easier
- takes a compare function, returns the index where it returned true
- returns the first position it was found at
- returns
-1 when nothing was found
- the findIndex callback gets the item, index and array as arguments
- combined with destructuring complex compares become short