digital length: Log10 vs String length

Benchmark created on

Description

"how many decimal digits hath 𝑛 ∈ ℕ" "Math.ceil(Math.log(𝑛)) or String(𝑛).length" "which is faster" "nani"

Setup

var logTenDofN = n => Math.ceil(Math.log10(n));
// only works if JS doesn't sciencify the string
// representation for large values (X.XXXe+X)
var strLenDofN = n => String(n).length;

var digitsOfN;

const L = 10e20;
function test () {
	let 𝑛 = 100;
	while ((𝑛 *= 1.19) < L) digitsOfN(𝑛);
}

Test runner

Ready to run.

Testing in
TestOps/sec
digits of n using `Math.ceil(Math.log10(𝑛))`
digitsOfN = logTenDofN;
test();
ready
digits of n using `String(𝑛).length`
// not only WAY slower, it also breaks when js
// decides to start using scientific notation
// (could parse e+X... thats for sure slower)
digitsOfN = strLenDofN;
test();
ready

Revisions

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