Comparison of performance impact for anonymous functions with JavaScript variable versus local named functions.

#	Count	Var\|Half\|Ggl	full,_sec	run,_sec	eval,_sec	file size,_bytes	render,_sec	Browser	Urls
0	3000	Each Fun Local	0.038	0.032	0.028	324889	0.006	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)	script
1	1500	Half Fun Local	0.031	0.022	0.02	324892	0.009	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)	script
2	3000	Each Var Local	0.045	0.028	0.031	336889	0.017	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)	script
3	1500	Half Var Local	0.023	0.02	0.023	336889	0.003	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)	script
4	3000	Each Fun Global	0.019	0.016	0.027	324893	0.003	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)	script
5	1500	Half Fun Global	0.015	0.009	0.019	324893	0.006	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)	script
6	3000	Each Var Global	0.022	0.018	0.03	336893	0.004	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)	script
7	1500	Half Var Global	0.015	0.009	0.023	336893	0.006	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)	script
total functions >			39000
total time,_sec			0.926

prerendered static files: 500 | 1000 | 3000 | 10000

Goal is to compare timing on similar set of functions(named and anonymous) for:

Load time: JS load and compile, no execution.
What is the impact of smaller footprint for named functions?
Execution time of
- Var as reference to anonymous function:
  var FunctionScr3Var27=function(){ window.RealCount=27; }
  Funtion - local named function:
  var function FunctionScr3Var27(){ window.RealCount=27; }
- Each - full set, all functions are called
- Half set: initialize all, but run each even function to see the promise of smaller load time for uninitialized variables.
  Set var SkipEachOdd=true; before JS include. In JS itself:
  if( !SkipEachOdd || 1 )FunctionScr3Var27();
- Global - functions are declared in window scope.
- Local - functions are declared in function scope:
  function GblFunctionScr3Var(){
  ...
  var FunctionScr3Var27=function(){ window.RealCount=0; } if( !SkipEachOdd || 0 )FunctionScr3Var0();
  ...
  }GblFunctionScr3Var();

Additional requirements:

Display file size for each test
Show backend render time
each generated function name shall be unique to avoid hash name optimization: another test shows that overriding is faster than new declaration.
Run test on various browsers, collect results on public blog
http://blog.firsov.net/2010/01/js-local-functions-anonymous-vs-named.html

Sources: index.jsp - this file | AnonymousJsVsNamed.js.jsp - JS rendering JSP

� Sasha Firsov, 2010

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