closure

//closures

function retirement(retirementAge){
    var a = ' years left until retirement.'
    return function(yearOfBirth){
        var age = 2020 - yearOfBirth;
        console.log((retirementAge - age) + a);
        
    }
}

var retirementUS = retirement(66);
var retirementGermany = retirement(65);
var retirementIceland = retirement(67);

retirementUS(1990);
retirementGermany(1990);
retirementIceland(1990);

//closures summary
/*
An inner function has always access to
the variables and parameters of its outer function,
even after the outer function has returned
*/

 

참조 : Udemy - The Complete JavaScript Course 2020 : Build Real Projects!

https://hyunseob.github.io/2016/08/30/javascript-closure/

JavaScript 클로저(Closure)