Pony.fm/resources/scripts/shared/underscore-extensions.js

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2015-08-31 17:42:21 +02:00
// save a reference to the core implementation
var 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: function(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 (var x = 0; x < array.length; x++) {
if (test(array[x])) return x;
}
// not found, return fail value
return -1;
}
});
_.indexOf([1,2,3], 3); // 2
_.indexOf([1,2,3], function(el) { return el > 2; } ); // 2