Question

I need help explanation of this script

var test = {
    property_1 : 'aaa',
    property_2 : 'bbb'
}

var place = function(str, ph){
    return test[ph];
}

What is the meaning of definition place and what will be return type of that function?
I can’t understand from where is parameter str and ph come?

Here is the screenshot tutorial i read that do this at line 19

Thank you.

Answer 1

What is the meaning of definition place?

Functions are first class in JavaScript. They can be assigned as values for variables.

You can then invoke that variable place, which will invoke the function it points to (its value).

What will be return type of that function?

In could be anything. Most likely it will be a string or undefined.

I can’t understand from where is parameter str and ph come?

They would be passed like so…

place(1, 2);

In your example, the first argument seems to be superflous as it’s not used in the function’s body.