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Javascript function that accepts a parameter in a different format

I was recently asked to write a javascript function (this was a coding test) where they wanted me to implement a function that will add and return values.

add(3,2);//should return 5
add(3)(2); //should return 5

I'm not sure if this is possible at all. I am not an expert in javascript, so it is possible to get the key from google search.

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2 answers


You will need to check if the first argument was specified first; if so, return the result immediately; otherwise, return the function that completes the addition:

function add(a, b)
{
    if (typeof b == 'undefined') {
        return function(b) {
            return a + b;
        }
    } else {
        return a + b;
    }
}

Alternatively, if you don't like duplicate logic:



function add(a, b)
{
    var f = function(b) {
        return a + b;
    };

    return typeof b == 'undefined' ? f : f(b);
}

It is also called partial function application or currying.

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Solution For add (x, y):

function add(x, y) {
    return x + y
}


Solution To add (x) (y):

function add(x) {
  return function(y){
    return x+y;
  }
}
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