let getBoxWidth = function() {
this.width=2;
};
alert(getBoxWidth.width);
Hello there! Can you explain why the output is undefined in this scenario?
let getBoxWidth = function() {
this.width=2;
};
alert(getBoxWidth.width);
Hello there! Can you explain why the output is undefined in this scenario?
The reason for the need to include the "new" keyword in front of the function() is because that syntax creates a function, not a class. By using the "new" keyword, you are essentially treating the function as a constructor for a new object.
Check out this demo on jsFiddle: http://jsfiddle.net/afGTh/
var circleRadius = new function() {
this.radius = 5;
};
alert(circleRadius.radius);
One common method for constructing a javascript object is to use a defined function:
function RectangleArea(length) {
this.length = length;
}
In general practice, constructors begin with an uppercase letter. Next, you can create an instance like so:
var ra = new RectangleArea(5);
alert(ra.length); // 5
If the object is simple enough, you could simplify it by doing this instead:
var ra = {length: 5};
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