Using JavaScript reflection to invoke a function

I am new to JavaScript and am struggling with how reflection works there.
What I want to do is: Given a String which is the function’s name, invoke that function.
E.g. var myString = "myFunctionName()" is given and then I want to invoke myFunctionName() using myString somehow.

Is this possible and how?

Thanks in advance!

>Solution :

It all depends on the context in which the function is declared.

For the browser’s window context:

function test() {
  console.log('Hello world!');
}

const string = 'test';

window[string]();