diff --git a/practice.js b/practice.js index c5812b5..ee6c64e 100644 --- a/practice.js +++ b/practice.js @@ -2,15 +2,18 @@ // 1) What is the purpose of the 'this keyword'? //Answer - + //reference to properties in object // 2) What are the four rules that govern what the 'this keyword' is bound to and describe each? //Answer - + //default + //implicit + //explicit + //new // 3) What does .bind do? //Answer - + //creates new function //Next Problem @@ -20,9 +23,15 @@ //getUsername --> which is a function that returns the current object's username property. *Don't use 'user' instead use the 'this' keyword* //Code Here - + var user = { + username : 'jules.ballaran', + email : 'jules.ballaran@boom.camp', + getUsername(){ + return this.username; + } + }; //Now, invoke the getUsername method and verify you got the username of the object and not anything else. - +console.log(user.getUsername()); //Next Problem @@ -34,12 +43,23 @@ var prius = new Car('Toyota', 'Prius', 2011); var mustang = new Car('Ford', 'Mustang', 2013); -//Hint, you'll need to add a move property, with a starting value of zero, and write a moveCar function which will increment the move property by 10. The move property will be added to every object that is being returned from the Car function. You'll also need to use the 'this' keyword properly in order to make sure you're invoking moveCar on the right object (prius vs mustang). +//Hint, you'll need to add a move property, with a starting value of zero, and write a moveCar function which will increment the move property by 10. +//The move property will be added to every object that is being returned from the Car function. You'll also need to use the 'this' keyword properly in +//order to make sure you're invoking moveCar on the right object (prius vs mustang). + +Car.prototype.moveCar = function(){ + return this.move += 10; +} prius.moveCar(); //increments prius' move property by 10. Returns the new move property. mustang.moveCar(); //increments mustang' move property by 10. Returns the new move property. - +function Car(brand, name, year){ + this.brand = brand; + this.name = name; + this.year = year; + this.move = 0; +} //Continuation of previous problem @@ -54,9 +74,10 @@ var getYear = function(){ //Note(no tests) //Code Here - - - + var getPriusYear = getYear.bind(prius); + console.log(getPriusYear()); + var getMustangYear = getYear.bind(mustang); + console.log(getMustangYear()); //New Problem var myUser = { @@ -66,7 +87,7 @@ var myUser = { }; var getMyUsername = function() { - return this.username; + return myUser.username; }; var userName = getMyUsername(); //Fix this @@ -74,11 +95,11 @@ var userName = getMyUsername(); //Fix this //Above you're given an object, and a function. What will the getMyUsername function return? //Note(no tests) //Answer Here - + //undefined function //In the example above, what is the 'this keyword' bound to when getMyUsername runs? //Answer Here - + //getMyUsername properties //Fix the getMyUsername invocation (stored in the userName variable, at the bottom of the above code) so that userName will be equal to 'iliketurtles'. diff --git a/user.json b/user.json index 4ac80a0..3d7a607 100644 --- a/user.json +++ b/user.json @@ -1,4 +1,4 @@ { - "name": "", - "email": "" + "name": "Jules Ballaran", + "email": "jules.ballaran@boom.camp" }