Run results for: Most Significant Digit

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.19 Safari/537.36 OPR/42.0.2392.0 (Edition developer)

Browser: Opera 42

Operating system: Windows

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
String Interpolation	32766.7 Ops/sec
Log based	31173.5 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)))); }

Run results for: Most Significant Digit

Comparing the performance of finding the most significant digit (in base 10), utilizing string interpolation and also log().

String Interpolation

Log based