Info

Is a hash (array) really faster than a switch?

Preparation code

<script>
  var theVar = 'j';
  
  var cases = [];
  cases['a'] = function() { var i = 1; i+=1; return i; };
  cases['b'] = function() { var i = 1; i+=1; return i; };
  cases['c'] = function() { var i = 1; i+=1; return i; };
  cases['d'] = function() { var i = 1; i+=1; return i; };
  cases['e'] = function() { var i = 1; i+=1; return i; };
  cases['f'] = function() { var i = 1; i+=1; return i; };
  cases['g'] = function() { var i = 1; i+=1; return i; };
  cases['h'] = function() { var i = 1; i+=1; return i; };
  cases['i'] = function() { var i = 1; i+=1; return i; };
  cases['j'] = function() { var i = 1; i+=1; return i; };
</script>

Test runner

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switch (theVar) {
case 'a':
 var i = 1; i+=1; 
 break;
case 'b':
 var i = 1; i+=1; 
 break;
case 'c':
 var i = 1; i+=1; 
 break;
case 'd':
 var i = 1; i+=1; 
 break;
case 'e':
 var i = 1; i+=1; 
 break;
case 'f':
 var i = 1; i+=1; 
 break;
case 'g':
 var i = 1; i+=1; 
 break;
case 'h':
 var i = 1; i+=1; 
 break;
case 'i':
 var i = 1; i+=1; 
 break;
case 'j':
 var i = 1; i+=1; 
 break;
default:
}

if (typeof cases[theVar] === 'function') {
 cases[theVar]();
} else {

}

var fun = cases[theVar];

if (typeof fun === 'function') {
 fun();
} else {

}

try{
 cases[theVar]();
}
catch(err)
{
}

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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 2: published by David Calhoun on 17th August 2010
• Revision 4: published on 17th August 2010
• Revision 7: published by Kevin Decker on 17th August 2010
• Revision 8: published by layane on 17th August 2010
• Revision 10: published on 17th April 2011
• Revision 11: published on 18th April 2011
• Revision 14: published by Maciej Pawłowski on 18th November 2011
• Revision 16: published on 15th March 2012
• Revision 17: published 1 day ago
• Revision 18: published 1 day ago

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