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How to check if there is a function declared ? The function name is available in variable. Example:

var n = 'f1';
if (!functionExists(n)) {
    //execute code when function not available
}
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  • maybe typeof window[n] === 'function', will work for global functions only Commented Nov 9, 2015 at 14:11
  • @Tushar will only work for global function. Will never work with closure for example Commented Nov 9, 2015 at 14:11
  • I guess you could use (eval) but be really cautionous when using it. Commented Nov 9, 2015 at 14:12
  • Silly me answering a duplicate question when I should have answered the original. So now I have. Commented Nov 9, 2015 at 14:42
  • The mentioned SO answers are enough for me. Commented Nov 10, 2015 at 7:45
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