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9,626 PointsJavaScript Function Constructor Methods
Hey Folks, I just wanted to ask how can I run the methods on the console or console.log() to check if the method is actually working?
function VideoType(title, category, cast, price, qty, length) {
this.title = title; // string
this.category = category; // string
this.cast = cast; //array
this.price = price; //number
this.qty = qty; //number
this.length = length; //number
// Setting a default value for the parameter inside the constructor = 5
this.changeQtyBy = function(ChangingNumber = 5) {
if (Number.isInteger(this.qty)) {
return this.qty + ChangingNumber;
} else {
return this.qty - ChangingNumber;
}
}
this.getCast = function() {
return this.cast; // this one line just returns values of the array
}
this.toString = function() { // add born part maybe
return `${this.title}|| ${this.category}|| ${this.cast}|| ${this.price}|| ${this.qty}|| ${this.length}|| ${this.getCast()}|| ${this.changeQtyBy()}`;
} //I added the methods in toString() method to display the results
} // end of the constructor
// calling this function body onload event
function startMeUp() {
let videos = [];
videos.push(new VideoType("Simba", "Cartoon", ["castItem1", "castItem2"], 25, 10, 50));
videos.push(new VideoType("Taken", "Thriller", ["castItem5", "castItem6"], 20, 11, 40));
videos.push(new VideoType("Execution", "Thriller", ["castItem3", "castItem4"], 15, 8, 30));
videos.push(new VideoType("Kungfu", "Comedy", ["castItem7", "castItem8"], 18, 7, 20));
for (var i = 0; i < videos.length; i++) {
videos[i].qty += 1;
// So it adds 1 to all the items of the qty property in the Object which is stored in the array videos. So we had to loop through it
// to add 5 units to the qty property for all videos. You must use a for loop to do this
}
let outputElement = document.getElementById('divVideoOutput');
// clears the output every time
outputElement.innerHTML = "";
for (let i = 0; i < videos.length; i++) {
var tempVideo = videos[i]; //Instead of typing StoreItems[i] every time the array we need, we can assign to a variable and use that to refer
var tempEL = document.createElement("p");
tempEL.innerText += tempVideo.toString();
//Append to the Div
outputElement.appendChild(tempEL);
} //end for loop
} // closing function startMeUP
// I didn't use the document.write as tried using .toString() method plus DOM createElement P and then appendChild instead
I know that changeQtyBy method is working as I tested within the toString() method. Although if I wasn't checking there. How to do that quickly on the console? I tried doing
console.log(changeQtyBy() ); and console.log(this.changeQtyBy() );
But both of them result in errors. Thanks in advance))))))
1 Answer
Steven Parker
231,153 PointsTo test a method, you must call it using an instance of the class, so create that first:
var simba = new VideoType("Simba", "Cartoon", ["castItem1", "castItem2"], 25, 10, 50);
console.log( simba.changeQtyBy() );