leftpadtesting

Benchmark created by Koen on

Setup

function leftpad(str, len, ch) {
      str = String(str);
      var i = -1;
      if (!ch && ch !== 0) ch = ' ';
      len = len - str.length;
      while (++i < len) {
        str = ch + str;
      }
      return str;
    }
    
    function leftpad2(str, len, ch) {
      str = String(str);
      if (ch === 0) {
        ch = '0';
      }
      return Array(Math.max(0, len - str.length)).join(ch || ' ') + str;
    }

Test runner

Ready to run.

Testing in
TestOps/sec
leftpad
leftpad('x', 40, 'hello world')
ready
leftpad2
leftpad2('x', 40, 'hello world')
ready
leftpadzero
leftpad('x', 40, 0)
ready
leftpad2zero
leftpad2('x', 40, 0)
ready

Revisions

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