Since 2015, JavaScript has improved immensely.
It’s much more pleasant to use it now than ever.
In this article, we’ll look at some instance methods of Array
and holes.
The findIndex
method lets us return the index of the item that’s found.
It takes a callback that returns the condition that we’re looking for.
The 2nd argument is the value of this
we use inside the callback.
It returns the index of the first element that meets the given condition.
If none is found, then -1 is returned.
For example, we can write:
const index = [2, -1, 6].findIndex(x => x < 0)
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