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24 lines
676 B
JavaScript
24 lines
676 B
JavaScript
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// save a reference to the core implementation
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var indexOfValue = _.indexOf;
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// using .mixin allows both wrapped and unwrapped calls:
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// _(array).indexOf(...) and _.indexOf(array, ...)
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_.mixin({
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// return the index of the first array element passing a test
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indexOf: function(array, test) {
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// delegate to standard indexOf if the test isn't a function
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if (!_.isFunction(test)) return indexOfValue(array, test);
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// otherwise, look for the index
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for (var x = 0; x < array.length; x++) {
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if (test(array[x])) return x;
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}
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// not found, return fail value
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return -1;
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}
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});
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_.indexOf([1,2,3], 3); // 2
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_.indexOf([1,2,3], function(el) { return el > 2; } ); // 2
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