Run results for: for vs for each

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Mac OS X 10.15.3

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
for loop	877648.9 Ops/sec
forEach loop	717989.4 Ops/sec

Script Preparation code:


array = [[ "a", 1 ], [ "b", 2 ],[ "c", 3 ]], [[ "name", "Sam" ],[ "age", 24 ],[ "name", "Sally" ]],[[ "i", "like" ], [ "to", "eat" ],[ "banana", "chips" ]]

Tests:

for loop
let pairs = {} for (let i = 0; i < array.length; i++) { pairs[array[i][0]] = array[i][1] }
forEach loop
let pairs = {} array.forEach(function(i) { pairs[[i[0]]] = i[1]; });

Run results for: for vs for each

for loop

forEach loop