Is it possible to get a list of the user defined functions in JavaScript?
I'm currently using this, but it returns functions which aren't user defined:
var functionNames = [];
for (var f in window) {
if (window.hasOwnProperty(f) && typeof window[f] === 'function') {
functionNames.push(f);
}
}
I'm assuming you want to filter out native functions. In Firefox, Function.toString() returns the function body, which for native functions, will be in the form:
function addEventListener() {
[native code]
}
You could match the pattern /\[native code\]/ in your loop and omit the functions that match.
As Chetan Sastry suggested in his answer, you can check for the existance of [native code] inside the stringified function:
Object.keys(window).filter(function(x)
{
if (!(window[x] instanceof Function)) return false;
return !/\[native code\]/.test(window[x].toString()) ? true : false;
});
Or simply:
Object.keys(window).filter(function(x)
{
return window[x] instanceof Function && !/\[native code\]/.test(window[x].toString());
});
in chrome you can get all non-native variables and functions by:
Object.keys(window);
Using Internet Explorer:
var objs = [];
var thing = {
makeGreeting: function(text) {
return 'Hello ' + text + '!';
}
}
for (var obj in window){window.hasOwnProperty(obj) && typeof window[obj] === 'function')objs.push(obj)};
Fails to report 'thing'.
thing is a global object. thing.makeGreeting is a function but not global. Neither of these things should be caught.