Object.keys().forEach() vs for in

Benchmark created by Kevin on

Setup

var obj = {}, i = 10000; 
    
    while ( i-- )
        obj[i] = i;

Test runner

Ready to run.

Testing in
TestOps/sec
Object.keys().forEach()
Object.keys(obj).forEach(function(obj){
    return obj;
});
ready
for-in
for ( var key in obj )
    if ( obj.hasOwnProperty(key) )
        return obj[key];
ready
Objest.keys() -> for loop
var keys = Object.keys(obj), i = 0; l = keys.length;
for ( i ; i < l; i++  )
    return obj[i];
ready
Object.keys()
var keys = Object.keys(obj);
ready

Revisions

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