indexOf () in IE 8 and _.indexOf() of underscore.js library - avoid case sensitivness

Question

I was using indexOf method on top of an array in IE 8 and it gave error (as it is not suported). I opted to use underscore.js library. I used the _.indexOf(array, value, [isSorted]) from underscorejs library. But indexOf() of underscore.js library is case sensitive but I want to ignore the case while comparing the value. How can I ignore case while using this function.

I can always use for loop to loop over the array and then use toLowerCase() but I wonder if there is out of box method which can do this for me.

indexOf is always case sensitive, but you can use a regex with the i flag to get case insensitive matches. — adeneo, Apr 18 '14 at 11:44

score 1 · Answer 1 · answered Apr 18 '14 at 11:45

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I would suggest you to make the string to lower case and then check the index of lower cased string.

Like:

"Hi I am string".toLowerCase().indexOf("Hi".toLowerCase());

answered Apr 18 '14 at 11:45

Amit Joki

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OP is asking for Array `indexOf`! – Bergi Apr 18 '14 at 14:16
@Bergi, but he is talking about case sensitiveness!! – Amit Joki Apr 18 '14 at 14:19
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Yes, a case insensitive matching instead of the `===` that Array::indexOf performs! – Bergi Apr 18 '14 at 14:21

score 1 · Answer 2 · edited May 23 '17 at 10:32

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I can always use for loop to loop over the array and then use toLowerCase()

That's basically the way to go.

but I wonder if there is out of box method which can do this for me.

No, yet you don't have to use a for-loop if you use this indexOf variant with an iterator callback.

Since I don't know what you do need the index for, maybe _.find or _.some do work as well for you.

edited May 23 '17 at 10:32

Community

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answered Apr 18 '14 at 14:23

Bergi

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indexOf () in IE 8 and _.indexOf() of underscore.js library - avoid case sensitivness

2 Answers2