Info

Trim function

Preparation code

<script>
/* mytrim3 is a tuned version of mytrim2 */
if(!String.prototype.trim || "\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF".trim() || navigator.userAgent.toString().toLowerCase().indexOf("chrome") != -1) var mytrim3 = function(str) {
      var c, i = 0, j = str.length - 1;
      for(; i <= j; i++) {
        c = str.charCodeAt(i);
        if(c < 8192) {
          if(c < 256 && (c == 32 || (c >= 9 && c <= 13) || c == 160)) {
            continue;
          } else if(c == 5760 || c == 6158) {
            continue;
          }
          break;
        } else if(c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288) {
          continue;
        }
        break;
      }
      for(; j >= i; j--) {
        c = str.charCodeAt(j);
        if(c < 8192) {
          if(c < 256 && (c == 32 || (c >= 9 && c <= 13) || c == 160)) {
            continue;
          } else if(c == 5760 || c == 6158) {
            continue;
          }
          break;
        } else if(c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288) {
          continue;
        }
        break;
      }
      return str.substring(i, j + 1);
    };
  else var mytrim3 = function(str) {
      return str.trim();
      }





        /*
mytrim2 is a tuned version of mytrim and is based on trim28 from here:
http://jsperf.com/mega-trim-test/20
*/
  if (!String.prototype.trim || "\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF".trim() || navigator.userAgent.toString().toLowerCase().indexOf("chrome") != -1) var mytrim2 = function(str) {
      var c;
      for (var i = 0; i < str.length; i++) {
        c = str.charCodeAt(i);
        if (c < 8192) {
          if (c < 256 && (c == 32 || (c >= 9 && c <= 13) || c == 160)) continue;
          else if (c == 5760 || c == 6158) continue;
          break;
        } else if (c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288) continue;
        break;
      }
      for (var j = str.length - 1; j >= i; j--) {
        c = str.charCodeAt(j);
        if (c < 8192) {
          if (c < 256 && (c == 32 || (c >= 9 && c <= 13) || c == 160)) continue;
          else if (c == 5760 || c == 6158) continue;
          break;
        } else if (c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288) continue;
        break;
      }
      return str.substring(i, j + 1);
      };
  else var mytrim2 = function(str) {
      return str.trim();
      }
      
      
      
      
      
      
      /*
mytrim() uses native function if it is available and can trim all required whitespace chars, otherwise it uses custom function.
because of slow native trim of chrome and chromium, custom function is used in them.
*/
  if (!String.prototype.trim || "\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF".trim() || navigator.userAgent.toString().toLowerCase().indexOf("chrome") != -1) var mytrim = function(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 || c == 11 || c == 160 || c == 5760 || c == 6158 || c == 8192 || c == 8193 || c == 8194 || c == 8195 || c == 8196 || c == 8197 || c == 8198 || c == 8199 || c == 8200 || c == 8201 || c == 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279) 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 || c == 11 || c == 160 || c == 5760 || c == 6158 || c == 8192 || c == 8193 || c == 8194 || c == 8195 || c == 8196 || c == 8197 || c == 8198 || c == 8199 || c == 8200 || c == 8201 || c == 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279) continue;
        else break;
      }
      return str.substring(i, j + 1);
      };
  else var mytrim = function(str) {
      return str.trim();
      }
      
      
      
      
      
      
      
  var mytrim_plain = function(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 || c == 11 || c == 160 || c == 5760 || c == 6158 || c == 8192 || c == 8193 || c == 8194 || c == 8195 || c == 8196 || c == 8197 || c == 8198 || c == 8199 || c == 8200 || c == 8201 || c == 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279) 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 || c == 11 || c == 160 || c == 5760 || c == 6158 || c == 8192 || c == 8193 || c == 8194 || c == 8195 || c == 8196 || c == 8197 || c == 8198 || c == 8199 || c == 8200 || c == 8201 || c == 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279) continue;
        else break;
      }
      return str.substring(i, j + 1);
      };

  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 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>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

e(trim1);

e(trim2);

e(trim3);

e(trim4);

e(trim5);

e(trim6);

e(trim7);

e(trim8);

e(trim9);

e(trim10);

e(trim11);

e(trim12);

e(trim13);

e(trim14);

e(trim15);

e(trim16);

e(trim17);

e(trim18);

e(trim19);

e(trim20);

e(trim21);

e(trim22);

e(trim23);

e(trim0);

e(trim_native);

e(mytrim)

e(mytrim_plain)

e(mytrim2)

e(mytrim3)

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by witek on 15th June 2011
• Revision 2: published by witek on 22nd August 2011
• Revision 6: published on 22nd September 2012
• Revision 7: published by Timo on 22nd September 2012
• Revision 8: published by Timo on 22nd September 2012
• Revision 10: published by Timo on 23rd September 2012
• Revision 11: published by Timo on 23rd September 2012
• Revision 12: published by Timo on 23rd September 2012
• Revision 16: published by Timo on 25th September 2012
• Revision 18: published on 6th October 2012
• Revision 19: published on 6th October 2012
• Revision 20: published on 6th October 2012
• Revision 22: published by Timo on 7th October 2012
• Revision 23: published by on 7th October 2012
• Revision 25: published on 15th November 2012
• Revision 26: published by termi on 13th March 2013
• Revision 28: published by Josep on 9th April 2013
• Revision 29: published by Josep on 9th April 2013
• Revision 30: published 3 weeks ago
• Revision 31: published 3 weeks ago

0 comments