JavaScript check typeof dynamically

Question

I would like to check if function is defined or not dynamically. I have a functionName variable which can be dynamicly changed... Here is my code:

function callback_user_login(object, status) {
    handle_simple_message(object);
}

var functionName = "callback_user_login";
console.log(typeof functionName); // returns string

How can I pass dynamicly named function name to typeof?

try to assign functionName to callback_user_login without the string "" — Christian Moen, Sep 06 '21 at 11:06
Does this answer your question? [How to check if function exists in JavaScript?](https://stackoverflow.com/questions/1042138/how-to-check-if-function-exists-in-javascript) — Phoenix1355, Sep 06 '21 at 11:07

score 0 · Accepted Answer · answered Sep 06 '21 at 11:07

0

If its in the global scope you can check

    window[varName]

or

    globalThis[varName]

answered Sep 06 '21 at 11:07

Sean Morris

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JavaScript check typeof dynamically

1 Answers1