Imagine I have an array of functions x = [f1,f2,f3,f4] that my user created. The user also has the ability to remove these functions later in the code.
Here's the challenge: How can a user request to remove f3, for instance, without knowing its position in the array?
I thought about implementing a function called x.remove(f3) and comparing the pointers of the argument with the items in the array, but how can this be achieved in JavaScript?
When dealing with objects in general, including functions, their identity plays a crucial role. By having a reference to the function, it becomes possible to locate and eliminate it within the array:
function remove(arr, target)
var index = arr.indexOf(target);
if (index != -1)
arr.splice(index, 1);
}
This method is not limited to functions but can be applied to any arbitrary value. For example, in your scenario, you would execute remove(array, specificFunction).
Utilize the equality operator for comparing references
var fun1 = function() { alert(1) };
var fun2 = function() { alert(2) };
var fun3 = function() { alert(3) };
var elements = [fun1, fun2, fun3];
var toRemove = window['fun2']; //or fun2
for (var j = 0; j < elements.length; j++) {
elements[j](); // alerts 1..2..3
if (elements[j] == toRemove)
elements.splice(j, 1);
}
for (var j = 0; j < elements.length; j++) {
// alerts 1..3
elements[j]();
}
To optimize the array, I suggest converting it into an object:
obj = {"func1" : func1, "func2": func2, "func3": func3, "func4" : func4};
This way, you can easily reference functions by name.
delete obj['func3'];
These are just the basics. Depending on your specific needs, consider assigning IDs to functions and linking them to corresponding buttons for removal. When a user triggers the button, the associated function will be removed from the object.
If functions have identifiable names, you can also store these as strings. Then, call the function using this method:
var obj = ["func1", "func2", "func3", "func4"];
window[obj[0]](); // This is equivalent to window['func1']() = window.func1()
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