Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var arr = [0, 1, 2, 3, true, false, null];
    
    /**
     * Map an array (or array-like object) and then compact the result. 
     * Both operations are combined into one loop.
     * @param  {Object|Array|*}  list
     * @param  {function(...)}   fn
     * @return {Array}
     */
    function mapFilter(list, fn, scope) {
        var l, i = 0, v, ret = [];
        if (list == null) { return ret; }
        for (l = list.length; i < l; i++) {
                i in list && (v = fn.call(scope, list[i], i, list)) && ret.push(v);
        }
        return ret;
    }
  };
</script>

Test runner

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arr.map(isFinite).filter(function(n){return !!n;});

mapFilter(arr, isFinite);

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by ryanve on 24th June 2012
• Revision 2: published by ryanve on 16th September 2012

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