Run results for: Split strings by character count (regex vs. slice vs. substr)

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Windows 7

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Testing Regex, Length 1	32.0 Ops/sec
Testing Regex, Length 10	96.4 Ops/sec
Testing Regex, Length 100	240.8 Ops/sec
Testing Regex, Length 9 kB	312.8 Ops/sec
Testing Slice, Length 1	14.4 Ops/sec
Testing Slice, Length 10	83.5 Ops/sec
Testing Slice, Length 100	1516.8 Ops/sec
Testing Slice, Length 9 kB	136477.3 Ops/sec
Testing Substr, Length 1	13.8 Ops/sec
Testing Substr, Length 10	87.2 Ops/sec
Testing Substr, Length 100	1533.0 Ops/sec
Testing Substr, Length 9 kB	137605.9 Ops/sec

Script Preparation code:

var cnt = 500 * 1024;
var str = []
for(var i=0; i < cnt; i++) {
  str.push( String.fromCharCode(Math.random() * 94 + 32) );
}
str = str.join("");

var regex = function(count) {
  var rgx = new RegExp("[\\s\\S]{1," + count + "}", "g");
  var parts = str.match(rgx);
};

var slice = function(count) {
  var parts = [];
  for(var i = 0, len = str.length; i < len; i += count) {
    parts.push( str.slice(i, i + count) );
  }
};

var substr = function(count) {
  var parts = [];
  for(var i = 0, len = str.length; i < len; i += count) {
    parts.push( str.substr(i, count) );
  }
};

Tests:

Testing Regex, Length 1
regex(1);
Testing Regex, Length 10
regex(10);
Testing Regex, Length 100
regex(100);
Testing Regex, Length 9 kB
regex(9 * 1024);
Testing Slice, Length 1
slice(1);
Testing Slice, Length 10
slice(10);
Testing Slice, Length 100
slice(100);
Testing Slice, Length 9 kB
slice(9 * 1024);
Testing Substr, Length 1
substr(1);
Testing Substr, Length 10
substr(10);
Testing Substr, Length 100
substr(100);
Testing Substr, Length 9 kB
substr(9 * 1024);

Run results for: Split strings by character count (regex vs. slice vs. substr)

Testing Regex, Length 1

Testing Regex, Length 10

Testing Regex, Length 100

Testing Regex, Length 9 kB

Testing Slice, Length 1

Testing Slice, Length 10

Testing Slice, Length 100

Testing Slice, Length 9 kB

Testing Substr, Length 1

Testing Substr, Length 10

Testing Substr, Length 100

Testing Substr, Length 9 kB