JavaScript Examples: Closures

closures-examples.js

var closure1;
var closure2;

var buildFullName = function(fname, lname) {
    // building full name inside the execution context
    var fullName = fname + ' ' + lname;
    
    // defining a function to return fullname according to execution context
    var printFullName = function() {
        return fullName;
    };
    
    // returning the fuction object
    return printFullName;
};

// Each time a function is invoked, a new execution context is created and persisted
// in memory. As buildFullName() returns a function that uses its context variables,
// then assigning the returned function to an outer context variable will use the values in
// the especific context when the function was invoked
var closure1 = buildFullName('jese', 'rodriguez');
var closure2 = buildFullName('charolyn', 'mendoza');

console.log('Closure 1 = ' + closure1());
console.log('Closure 2 = ' + closure2());