How to create an object inside an object in Javascript?

Question

I have a want to create a object Metrics within which I need to initialize various other objects such as StatsD.

I know how to create Metrics object in javascript.

function Metrics(params) {
  // initialize params
}

Metrics.prototype.functionName = function() {

}

However I am confused is how to embed an object inside another object and access its methods ?

In java it would be easy:

class Metrics {
   StatsD statsD;
}

new Metrics().statsD.increment("foobar");

How would I do the same in javascript ?

Bergi · Accepted Answer · 2019-02-27 22:55:05Z

2

You'd do it in the same way as in Java:

function Metrics(params) {
    this.statsd = new StatssD();
}

The only difference is that you don't have to declare the attribute with its type - just initialising the property in the constructor is enough.

answered Feb 27, 2019 at 22:55

Bergi

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Comments

Jack Bashford · Accepted Answer · 2019-02-27 22:59:09Z

0

Just set the property (statsd in this case) to a new object (new StatsD()):

function Metrics(params) {
    //Initialize params
    this.statsd = new StatsD();
}

You could also attach the StatsD to the prototype:

Metrics.prototype.statsd = StatsD();

answered Feb 27, 2019 at 22:59

Jack Bashford

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