Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = [ 1, 2, 3, 4, 5 ],
        b = [ 1 ];
    
    function run_if ( a ) {
        var l = a.length;
    
        if ( l === 1 ) {
           return;
        }
    
    
        for ( var i = 0; i < l; i++ ) {
        }
    }
    
    function run_for ( a ) {
        var l = a.length;
    
        for ( var i = 0; i < l; i++ ) {
        }
    }
  };
</script>

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run_if( a );
run_if( b );

run_for( a );
run_for( b );

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