CODEWITHSUNDEEP
javascriptclosures
user544079
user544079

Reputation: 16629

function as a return type javascript

I am trying to create a closure 

function init(x){
     var y = 10;
     return function display(a){
        return y + a + x;
     }
     display(5);
}
init(4);

Above closure should return 19. However, it returns a function.

Upvotes: 0

Views: 29

Answers (3)

Alcides Queiroz
Alcides Queiroz

Reputation: 9576

The last line in your init function is unreachable, once it's after a return statement. If you want to return a primitive value, you have to return the result of the display function.

function init(x){
     var y = 10;
     function display(a){
        return y + a + x;
     }
     return display(5);
}
init(4);

Upvotes: 0

WebMentor
WebMentor

Reputation: 36

You have to move the "return". The return keyword will end the code execution of the function and return the value that's passed to the return (in your case a function). If your result has to be 19, consider using the following code:

function init(x) {
     var y = 10;

     function display(a) {
        return y + a + x;
     }

     return display(5);
}

init(4);

Upvotes: 0

agrum
agrum

Reputation: 397

The return is in front of the function, not the call.

function init(x){
     var y = 10;
     function display(a){
        return y + a + x;
     }
     return display(5);
}
init(4);

Upvotes: 2

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