Say I have:
a=[[1,2],[3,4],[5,6]]
Is this wrong?
a.indexOf([1,2])
Why -1?
Say I have: a=[[1,2],[3,4],[5,6]] Is this wrong? a.indexOf([1,2]) Why -1?
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Because
[1,2] == [1,2]isfalseThere is no equality of different instances of javascript objects.
From the MDN on
==:You could build your own function to look for an array in an array, but in this case, as you would have to check all elements of the internal arrays (or build a hash code), this won’t be fast. You’d better avoid this kind of search.