java script call methods from another methods

Question

I'm new in js.

I see code example:

foo.bar().baz()

How described foo bar and baz that we can call so?

Thank you.

Alex Wayne · Accepted Answer · 2011-08-12 18:11:59Z

8

What are you are probably after is called chaining. A method can return the object it's running on this, so that another method may be called.

var foo = {
  bar: function() {
    doStuff();
    return this;
  },

  baz: function() {
    doOtherStuff();
    return this;
  }
};

foo.bar().baz();

This is exactly how jQuery works, in order to allow things like:

$('#foo')
  .html('<p>hi</p>')
  .addClass('selected')
  .css('font-size', '24px')
  .show();

answered Aug 12, 2011 at 18:11

Alex Wayne

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2 Comments

K'' Over a year ago

a quick comment for clarification since you said that you are new to JS, this is not a JS feature, you can achieve this in different programming languages by returning an object which has other methods you can invoke

Alex Wayne Over a year ago

Yep. In fact, wikipedia has example in C#, C++, Java and PHP. en.wikipedia.org/wiki/Method_chaining

Adrian Rodriguez · Accepted Answer · 2011-08-12 18:11:57Z

0

So let's say you had an object foo with two methods: bar and bad. The implementation of bar would be like this: function bar() { /* do work */ return this; } That returns foo itself so you can call baz since it's defined in foo.

answered Aug 12, 2011 at 18:11

Adrian Rodriguez

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