Run results for: 1d to 2d array - for i vs while splice

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Safari/537.36

Browser: Chrome 74

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
for i; += 2	3794.6 Ops/sec
while splice	6452085.5 Ops/sec

Script Preparation code:

arr = [];
for (i=0; i<1024; i++) {
  arr.push(i); 
}

arr2 = [];
for (i=0; i<1024; i++) {
  arr2.push(i); 
}

Tests:

for i; += 2
var pairs = []; for (let i = 0; i < arr.length - 1; i += 2) { pairs.push([arr[i], arr[i + 1]]); }
while splice
var pairs = []; while(arr2.length) pairs.push(arr2.splice(0,2));