Triple Add

##Example tripleAdd(10)(20)(30); 60


returns the total of 3 numbers/ invokations

function tripleAdd(num1) {
	return function(num2) {
		return function(num3) {
			return num1 + num2 + num3;
		};
	};
}
tripleAdd(10)(20)(30);

First we need to know is that we don’t invoke 3 functions but one function called tripleAdd and we invoke the returns inside tripleAdd.N

So we define a function tripleAdd and it will take our first number as parameter in our case num1. Inside a tripleAdd all we want to do is to return another callback function and this function will take our second number num2 as a parameter.

Inside the second callback function we return a third callback function and this function will take third number as a parameter in our case num3.

Finally we return num1+num2+num3. So we have a function that returns a function and that function returns third function and in the end we add all the function parameters