[Learning]#21 JS: Object — Constructors

About Constructors

“The way to create an ‘object type’, is to use an object constructor function.
Objects of the same type are created by calling the constructor function with the new keyword.”
by W3C School

As the example we mentioned in the last article, there was only one trip.
Now, if we have multiple trips’ score to count, we’ll need a constructor to help us.

Example: This time, we will have 2 trips

function Trip(name,score){ //When it comes to creating a construtor function, usually people use capital letter.
    this.name=name; //"this" represents an empty object auto created by the system.
    this.score=score;
    this.outdoor=function(){ 
        this.score=this.score+10;
    };
    this.rainyDay=function(){ 
        this.score=this.score-5;
    };
    this.snacksnBBQ=function(){ 
        this.score=this.score+20;
    };
    this.napping=function(){ 
        this.score++;
    };
    this.report=function(){ 
        alert(this.name+":"+this.score)
    };
 
}
 
var trip1=new Trip("Couple Trip",70); //befor constructor, adding a "new" 
trip1.outdoor(); 
trip1.napping(); 
trip1.report();

→ The result is 81

var trip2=new Trip("Company Trip",60);
trip2.rainyDay(); 
trip2.snacksnBBQ(); 
trip2.report();

→ The result is 75

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