Run results for: Most Significant Digit

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Browser: Chrome 54

Operating system: Mac OS X 10.11.6

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
string interpolation	2427.1 Ops/sec
log	2361.8 Ops/sec

Script Preparation code:

var randomNumbers = [0, 1, 632]

Tests:

String Interpolation
for(var n of randomNumbers){ console.log((""+n)[0]) }
Log based
for(var n of randomNumbers){ console.log(n / (10 ** Math.floor(Math.log10(n)))); }