test if number

JavaScript performance comparison

Test case created by Adam Krebs

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var num = '5'
    var string = 'nope'
    var mixed1 = '6seven'
    var mixed2 = 'eight9ten'
  };
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
regular expression
 
var digitFormatter = function (val) {
  if (!/^\d+$/.test(val)) { return true }
};

digitFormatter(num);
digitFormatter(string);
digitFormatter(mixed1);
digitFormatter(mixed2);
 pending…
Unary operator
 
var digitFormatter = function(val) {
  var digit = +val;
  if (!isNaN(digit)) { return true }
};

digitFormatter(num);
digitFormatter(string);
digitFormatter(mixed1);
digitFormatter(mixed2);
 pending…
ParseInt
 
var digitFormatter = function(val) {
  var digit = parseInt(val, 10);
  if (!isNaN(digit)) { return true }
};

digitFormatter(num);
digitFormatter(string);
digitFormatter(mixed1);
digitFormatter(mixed2);
 pending…

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