Exercise - Objects

by Colin Cheevers

JavaScript

// 1)
//
// Create a function that accepts an object as an argument
// and returns a copy of that object
// So that the following example will run correctly
var joe = {
    name: "Joe",
    age: 32
}

//Colin Version
/*function copy(obj) {
    
    var arrayProp = Object.getOwnPropertyNames(obj);
    var cloneObj = Object.create(Object.prototype);
    
    for(var i = 0; i < arrayProp.length; i++)
    {
       Object.defineProperty(cloneobj,{arrayProp[i]});        
    }
}*/

//Solution
function copy(obj) {
    
    var newObj = {};    
    Object.getOwnPropertyNames(obj).forEach(function(prop) {
        newObj[prop] = obj[prop];
    
    });    
    return newObj;    
}


// Testing your copy function...
var jim = copy(joe);
console.group("Test");
if (jim === joe) {
    console.log("Nope! They are the same object")   
} else {
     console.log("Great job! You made a copy.");   
}
console.log("The two objects are:", jim, ",", joe);
console.groupEnd();

// 2)
//
// Make sure the function ONLY copies "own" properties
// hint: use hasOwnProperty()

// 3) Bonus
//
// Add the function as a method on the joe object, 
// then invoke the method of that object to copy it
// hint: you will use "this" keyword in your method
//
// ex: joe.copy(); // outputs a copy