jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.
jsperf.com URLs are mirrored at the same path, e.g:
https://jsperf.com/negative-modulo/2
Can be accessed at:
https://jsperf.app/negative-modulo/2
Trim function
Added new trim27, which seems to beat native trim of Chrome!
<script>
function trim0(str) { return str.replace(/^(\s*)/, '').replace(/\s*$/, ''); }
function trim1(str) { return str.replace(/^\s\s*/, '').replace(/\s\s*$/, ''); }
function trim2(str) { return str.replace(/^\s+/, '').replace(/\s+$/, ''); }
function trim3(str) { return str.substring(Math.max(str.search(/\S/), 0), str.search(/\S\s*$/) + 1); }
function trim4(str) { return str.replace(/^\s+|\s+$/g, ''); }
function trim5(s) {
var str = s.match(/\S+(?:\s+\S+)*/);
return str ? str[0] : '';
}
function trim6(str) { return str.replace(/^\s*(\S*(\s+\S+)*)\s*$/, '$1'); }
function trim7(str) { return str.replace(/^\s*(\S*(?:\s+\S+)*)\s*$/, '$1'); }
function trim8(str) { return str.replace(/^\s*((?:[\S\s]*\S)?)\s*$/, '$1'); }
function trim9(str) { return str.replace(/^\s*([\S\s]*?)\s*$/, '$1'); }
var trim10_whitespace = ' \n\r\t\f\x0b\xa0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000';
function trim10(s) {
var str = s;
for (var i = 0; i < str.length; i++) {
if (trim10_whitespace.indexOf(str.charAt(i)) === -1) {
str = str.substring(i);
break;
}
}
for (i = str.length - 1; i >= 0; i--) {
if (trim10_whitespace.indexOf(str.charAt(i)) === -1) {
str = str.substring(0, i + 1);
break;
}
}
return trim10_whitespace.indexOf(str.charAt(0)) === -1 ? str : '';
}
function trim11(s) {
var str = s.replace(/^\s+/, '');
for (var i = str.length - 1; i >= 0; i--) {
if (/\S/.test(str.charAt(i))) {
str = str.substring(0, i + 1);
break;
}
}
return str;
}
function trim12(s) {
var str = s.replace(/^\s\s*/, ""),
ws = /\s/,
i = str.length;
while (ws.test(str.charAt(--i)));
return str.slice(0, i + 1);
}
// trim12 with \s+ insteas od \s\s*
function trim13(s) {
var str = s.replace(/^\s+/, ""),
ws = /\s/,
i = str.length;
while (ws.test(str.charAt(--i)));
return str.slice(0, i + 1);
}
// trim12 without single ws=/\s/
function trim14(s) {
var str = s.replace(/^\s\s*/, ""),
i = str.length;
while (/\s/.test(str.charAt(--i)));
return str.slice(0, i + 1);
}
// same as trim11, but > not >=
// buggy for "a " in Chromium
function trim15(str) {
str = str.replace(/^\s+/, '');
for (var i = str.length - 1; i > 0; i--) {
if (/\S/.test(str.charAt(i))) {
str = str.substring(0, i + 1);
break;
}
}
return str;
}
trim15.buggy = true;
// trim12 on http://zanstra.com/base/blog/trim_mac_roundup
var trim16_whitespace = ' \n\r\t\v\f\u00a0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000';
function trim16(s) {
var i = 0, j = s.length-1;
while(i < s.length && trim16_whitespace.indexOf(s.charAt(i)) != -1)
i++;
while(j > i && trim16_whitespace.indexOf(s.charAt(j)) != -1)
j--;
return s.substring(i,j+1);
}
// trim12 in http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-13585
// looks to be buggy in Opera and Chromium. Works ok in Epiphany.
// buggy for " ala ma " in Chromium
// buggy for "ala ma " in Chromium
function trim17(str) {
var str1 = str.replace(/^\s\s*/, '');
var len = str1.length;
if (len && /\s/.test(str1.charAt(len-1))) {
var re = /.*\S/g;
re.test(str1);
str1 = str1.slice(0, re.lastIndex);
}
return str1;
}
trim17.buggy=true;
// trim in http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-39371
// slightly changed return
//var trim18_whitespace = trim21_whitespace;
function trim18(str) {
var len = str.length;
if (len) {
while (trim21_whitespace[str.charCodeAt(--len)]);
if (++len) {
var i = 0;
while (trim21_whitespace[str.charCodeAt(i)]) {
++i;
}
}
return str.substring(i, len);
}
return str;
}
// http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-21439
function trim19 (str) {
var ws = /\s/, _start = 0, end = str.length;
while(ws.test(str.charAt(_start++)));
while(ws.test(str.charAt(--end)));
return str.slice(_start - 1, end + 1);
}
// http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-28776
function trim20(str) {
var whitespace = " \n\r\t\f";
for (var i = 0; i < str.length; i++)
if (whitespace.indexOf(str.charAt(i)) < 0)
break;
for (var j = str.length - 1; j >= i; j-- )
if (whitespace.indexOf(str.charAt(j)) < 0)
break;
return str.substring(i, j+1);
}
// in original it was manually populated, but looping is nicer
var trim21_whitespace = {};
var trim21_ww = [
0x0009,0x000a,0x000b,0x000c,0x000d,0x0020,0x0085,0x00a0,0x1680,0x180e,0x2000,0x2001,0x2002,0x2003,0x2004,0x2005,
0x2006,0x2007,0x2008,0x2009,0x200a,0x200b,0x2028,0x2029,0x202f,0x205f,0x3000
];
for (var i = 0; i < trim21_ww.length; i++) {
trim21_whitespace[trim21_ww[i]] = true;
}
// http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-25052
// looks to be buggy as it returns different results than others in Epiphany, Chromium (correct in Opera)
// bug for " a"
// buggy for ' 40. To no one will we sell.' in Chromium
function trim21(str) {
var n = str.length;
var s = trim21_whitespace;
var i;
if (!n) return str;
if (n && s[str.charCodeAt(n-1)]) {
do {
--n;
} while (n && s[str.charCodeAt(n-1)]);
if (n && s[str.charCodeAt(0)]) {
i = 1;
while (i < n && s[str.charCodeAt(i)])
++i;
}
return str.substring(i, n);
}
if (n && s[str.charCodeAt(0)]) {
i = 1;
while (i < n && s[str.charAt(i)])
++i;
return str.substring(i, n);
}
return str;
};
trim21.buggy=true;
// rialto framework, http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-25038
// VERY looks to be buggy as it returns different results than others in Epiphany, Chromium, Opera (in Opera even differently)
// bug for " ", ' 40. To no one. ', '40. To no one. '
function trim22(str) {
return str.replace(/^\s*(\b.*\b|)\s*$/, '$1');
}
trim22.buggy=true;
// http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-13585
// slightly moded return
// looks to be buggy in Chromium (correct in Opera and Epiphany)
// buggy for " ala ma " in Chromium
// buggy for "ala ma " in Chromium
function trim23(s) {
var str = s.replace(/^\s\s*/, ''),
len = str.length;
if (len && /\s/.test(str.charAt(len-1))) {
var re = /.*\S/g;
re.test(str);
return str.slice(0, re.lastIndex);
} else {
return str;
}
}
trim23.buggy=true;
// http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-6808
this.trim24 = (function(){
var ws = {},
chars = ' \n\r\t\v\f\u00a0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000';
for(var i = 0; i < chars.length; i++ )
ws[chars.charAt(i)] = true;
return function( str ){
var s = -1,
e = str.length;
while( ws[str.charAt(--e)] );
while( s++ !== e && ws[str.charAt(s)] );
return str.substring( s, e+1 );
};
})();
// http://blog.stevenlevithan.com/archives/faster-trim-javascript#comment-6169
function trim25(s) {
var str = s.replace(/^\s+/, '');
for (var i = str.length; i--;)
if (/\S/.test(str.charAt(i)))
return str.substring(0, ++i)
return str
}
// bug for " s"
function trim26(str) {
return str.replace(/^\s*(\S.*\S)?\s*$/, '$1');
}
trim26.buggy=true;
function trim27(str) {
var c;
for (var i = 0; i < str.length; i++) {
c = str.charCodeAt(i);
if (c == 32 || c == 10 || c == 13 || c == 9 || c == 12) continue; else break;
}
for (var j = str.length - 1; j >= i; j--) {
c = str.charCodeAt(j);
if (c == 32 || c == 10 || c == 13 || c == 9 || c == 12) continue; else break;
}
return str.substring(i, j + 1);
}
function trim_native(str) {
return str.trim(); // should throw is no such function
}
var inp = " \n\n \n\n a \n a\n a\n a\n a \n\t\ta\t\ta\njahsdkjahkjshdakjhsdkahskd akhsjdh akjshd kashdkajhsd kajshd \nkauyiuqhwep iasldk qpwoie ad \n askdjaslkdjaslkjdaoiur qowioqwhr aspodiquw ijasod iqwiue pqowipoqiw epoqiwpeo iaslkjdqur \t kjahsdkj hakshd\nkajhdk\nk as d \t\n".split('\n');
function e(f) {
var x = [];
for (i = 0; i < inp.length; i++) {
x.push(f(inp[i]));
}
return x;
}
</script>Ready to run.
| Test | Ops/sec | |
|---|---|---|
| trim1 | | ready |
| trim2 | | ready |
| trim3 | | ready |
| trim4 | | ready |
| trim5 | | ready |
| trim6 | | ready |
| trim7 | | ready |
| trim8 | | ready |
| trim9 | | ready |
| trim10 | | ready |
| trim11 | | ready |
| trim12 | | ready |
| trim13 | | ready |
| trim14 | | ready |
| trim15 | | ready |
| trim16 | | ready |
| trim17 | | ready |
| trim18 | | ready |
| trim19 | | ready |
| trim20 | | ready |
| trim21 | | ready |
| trim22 | | ready |
| trim23 | | ready |
| trim0 | | ready |
| trim-native | | ready |
| trim27 | | ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.