So I found this piece of code and it obviously works (as it has been in production for years):
window[someMethod] = function (tmp) {
callback({prop:"val"}, tmp);
// Garbage collect
window[someMethod] = undefined;
try {
delete window[someMethod];
}
catch (e) { }
if (head) {
head.removeChild(script);
}
// head refers to DOM head elem and script refers to some script file elem
};
Curious to know, how does it work?
undefined
within its body and try
to
delete
itself?undefined
and delete
until the call is finished? And how?Hopefully this is making sense.
Remember you can't ever explicitly delete something in Javascript. All you can do is remove all the references to it and so let the garbage collector remove it on the next cycle. By the end of this function, the function itself is still in memory, but there are no external references to it. Next time the GC runs, it will spot this and deallocate its memory.
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