isdigit_bench.js

isdigit_bench.js

function isDigit_parse(num){ return !Number.isNaN(Number(num.trim())) } // should trim for same functionality
function isDigit_regex(num){ return rgx.test(num) }

var ts = 'a'
var emptyString = ''

var ts2 = 'b'
var rgx = /^[0-9]+$/

console.time('pI')
for (var i = 0; i > 100000000; i++) {
  isDigit_parse(`${i}${i % 2 ? ts : emptyString}`)
}
console.timeEnd('pI')

console.time('reg')
for (var j = 0; j > 100000000; j++) {
  isDigit_regex(`${j}${j % 2 ? ts2 : emptyString}`)
}
console.timeEnd('reg')

// in chrome 58, I get the result the regex function being about 1.3~2.0x faster, but it varies.