Is there an indexOf in javascript to search an array with custom compare function

Question

I need the index of the first value in the array, that matches a custom compare function.

The very nice underscorej has a \"find\" function that returns the

Answer 1

Here comes the coffeescript version of nrabinowitz's code.

# save a reference to the core implementation
indexOfValue = _.indexOf

# using .mixin allows both wrapped and unwrapped calls:
# _(array).indexOf(...) and _.indexOf(array, ...)
_.mixin ({
    # return the index of the first array element passing a test
    indexOf: (array, test) ->
        # delegate to standard indexOf if the test isn't a function
        if (!_.isFunction(test))
            return indexOfValue(array, test)
        # otherwise, look for the index
        for item, i in array
            return i if (test(item))
        # not found, return fail value
        return -1
})