Can someone explain to me how this function works?

Question

I am learning code, and I am trying to understand higher order functions and abbreviations. I do not understand how this part of the code works to return "true".

function greaterThan(n) {
  return function(m) { return m > n; };
}

var greaterThan10 = greaterThan(10);

console.log(greaterThan10(11));

Thanks for the help.

Answer 1

The function greaterThanreturns the function when called. The returned function has access to all members of the external function even after the function returns. This is called closure.

function greaterThan(n) {
    return function (m) {
        return m > n;
    };
}

When following the instructions

var greaterThan10 = greaterThan(10);

it is converted as

var greaterThan10 = function (m) {
    return m > 10;
};

So, greaterThan10now it is a function and can be called as

console.log(greaterThan10(11));

m 11, return 11 > 10; true.

:

JavaScript?

, JS

http://dmitryfrank.com/articles/js_closures