Run results for: Loop Comprasion

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

for-in

136/s

chain forEach

120/s

View exact numbers

Test name	Executions per second
✓ for-in	136 Ops/sec
chain forEach	120 Ops/sec

Script Preparation code:

var MyArray = Array(1000).fill({
        description:
          'Creates a deep copy of source, which should be an object or an array.',
        myNumber: 123456789,
        myBoolean: true,
        jayson: {
          stringify:
            'JSON.stringify() method converts a JavaScript value to a JSON string....',
          parse: 'JSON.parse() method parses a JSON string...',
        },
      });

Tests:

chain forEach
MyArray.forEach((item)=>{ console.log(item.myNumber); });
for-in
for(const item in MyArray) { console.log(item.myNumber); }