Run results for: Extract prop from object array, shorter arrow function syntax

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:60.0) Gecko/20100101 Firefox/60.0

Browser: Firefox 60

Operating system: Mac OS X 10.13

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

var testArray = []
for(var i=0;i<100000;i++){
  testArray.push({ id: i, val: Math.random()});
}

Tests:

Using Array.prototype.map()
var vals = testArray.map(a => a.val);
Using traditional for loop
var vals=[]; for(var i=0;i<testArray.length;i++){ vals.push(testArray[i].val); }
Using ES6 for..of
var vals=[]; for(var item of testArray){ vals.push(item.val); }