Top 100+ Require Js Interview Questions And Answers
Question 1. What Is The Role Of Optimizer?
Answer :
The Optimizer is a built process in which your venture is deployed to give up person and its combines all scripts/css files collectively and minify them.
Question 2. How To Use Require Js With Jquery?
Answer :
The Require JS makes use of jQuery and plenty of any other dependency i.E.
Require(['jquery'], feature ($)
//jQuery became loaded and may be used now.
);
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Question three. What Is Amd Module?
Answer :
The AMD is stands for Asynchronous Module Definition and is used for outlining modules and their dependencies with asynchronous manner.
Question 4. What Is Data-major Attribute?
Answer :
The data-fundamental attribute is an attribute that Require JS will check to begin script loading. The information-major set to the base URL for all of the scripts.
Example:-
<!DOCTYPE html>
<html>
<head>
<script data-main="libs/main" src="libs/require.Js"></script>
</head>
<body>
<h1> RequireJS Sample apps</h1>
</body>
</html>
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Question 5. What Is Module In Require Js?
Answer :
Module is impartial unit of program which make smooth upkeep and reusability of code. In RequireJs we talk approximately JavaScript module.
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Question 6. What Is The Project Structure Of Require Js?
Answer :
Project listing and the structure seems like:-
app.Js
index.Html
lib
modules
template.Js
require.Js
jquery.Js
underscore.Js
Question 7. What Is Config Function?
Answer :
The Require JS may be initialized by passing the main configuration in the HTML template through the facts-essential attribute.
If you want to update the Require JS configuration values together with your personal configurations cost. You can do the use of the require js. Config characteristic.
The configurations options:-
config - This is for configuration to a module by using the use of the config choice
baseUrl -This is the foundation direction to begin the loading of modules.
Paths - this is the path mapping for modules that don’t exists in underneath the base URL.
Shims - This is use for configuration for dependencies.
Deps - array of dependencies to load
url Args -This is the question string arguments are used to fetch all sources which are loaded via using Require JS.
Callback -It executes a feature after loading the dependencies and is needed while Require is distinctive as config item before loading Require JS.
Xhtml - It is used to create the script elements by the usage of the record.CreateElement() technique.
Script Type - It defines the cost for script kind attribute used within the document. Default type is "text/javascript".
Example looks like:-
require.Config(
baseUrl: 'scripts/app',
paths:
lib: '../lib'
,
shim:
'spine':
deps: ['underscore'],
exports: 'Backbone'
);
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Question 8. What Are Asynchronous Module Definition (amd) Modules?
Answer :
Defining Modules:-The Module is defined using outline () approach and it used for loading the module i.E.
Outline(
us of a:"India",
kingdom: "UP",
city: "Noida",
userDetail: feature ()
go back "User Detail";
);
Defining Functions:- A module can also use a feature without dependencies i.E.
Outline(function ()
go back
country:"India",
kingdom: "UP",
city: "Noida"
);
Defining Functions with Dependencies:- The Dependencies module seems like.
Outline(["../comp", "../user"],
function(comp, consumer)
return
us of a:"India",
state: "UP",
town: "Noida",
addUser: characteristic()
comp.Decrement(this);
user.Upload(this);
);
Defining a Module as a Function:- Its looks like.
Outline(["../comp", "../user"],
feature(comp, consumer)
go back feature(userName)
go back userName != null ? UserName :'NA'
);
Defining a Module with a Name:- Its seems like.
Outline("Users", ["../comp", "../user"],
function(comp, person)
return
usa:"India",
country: "UP",
city: "Noida",
addUser: characteristic()
console.Log(this);
);
Question nine. When Should I Use Require () And When To Use Define ()?
Answer :
The outline () approach looks as if:-
The outline () method is used for facilitating module definition
The define () approach accepts two optionally available parameters module ID and array of required modules [dependencies]
The define () method MUST return the implementation in your module i.E.
Outline(
module_id /*non-obligatory*/,
[dependencies] /*elective*/,
definition characteristic /*characteristic for instantiating the module or object*/
);
And
define (['moduleA', 'moduleB'], characteristic (moduleA, moduleB)
//define the module value by way of returning a fee
return function () ;
);
The require () approach seems like:-
The require () method is used for dealing with dependency loading
The require () function doesn't should return the implementation of a brand new module.
Require(['jquery'], function ($)
//jQuery become loaded and can be used now.
);
Example 1:-
define( 'MyApp', ["marionette"], characteristic (Marionette)
// installation the app instance
var app = new Marionette.Application();
app.On("initialize:after", feature()
console.Log("initialize commenced.");
);
// export the app from this module
return app;
);
Example 2:-
// Fetch and execute Marionette App
require( ["MyApp"], feature (app)
// Execute App
app.Begin();
);
Example three:-
define(
"root":
"india": "india",
"australia": "australia",
"england": "england"
);
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Question 10. What Are Disadvantage Of Require Js?
Answer :
No aid for AMD in Node.Js
Not all modules implement AMD
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Question eleven. What Are The Main Features Of Require Js?
Answer :
Require JS manages the dependencies between JavaScript files and improves the great of the code and alertness velocity.
It is combines and minifies the modules into one script for pace-up.
Require JS Collecting the distinctive JavaScript documents from exceptional modules at the compilation time.
Easy debugging
Lesser HTTP requests
Reduce code Complexity in massive software.
And so on.
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Question 12. How To Define Entry Point For Require Js?
Answer :
We want to define an html document and it could be "index.Html" wherein Require JS is loading i.E.
<!DOCTYPE html>
<html>
<head>
<script data-main="libs/main" src="libs/require.Js"></script>
</head>
<body>
<h1> Require JS Sample apps</h1>
</body>
</html>
In above instance, the statistics-primary attribute of require.Js will start initialization of documents.
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Question thirteen. Why Do People Use Require Js? What Are The Benefits?
Answer :
It is an open supply JavaScript library.
It is AMD like minded asynchronous module loader.
It is Asynchronous by way of nature.
Lazy loaded on-call for.
It is easily portable.
It is Avoids worldwide variables.
It has ability to load nested dependencies.
Its Dependencies are clean to pick out.
It may be without difficulty configured.
It can load a couple of variations of the same library.
It will make the website greater optimize and velocity.
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Question 14. How To Install Require Js?
Answer :
You can set up the trendy release of Require JS from the command activate the use of the underneath commands-
//Install the Require JS package deal
npm install -g require js
Question 15. What Is Require Js?
Answer :
Require JS is a JavaScript library and AMD well suited asynchronous module loader.
Require JS is used to loads the JavaScript files and remedy their dependencies and its supported to the trendy versions of popular browsers.
Require JS facilitates to improve the overall performance and code of excellent.
Require JS changed into evolved by using David Mark. Its open source and it changed into released in 2009.
Require JS is utilized by node.Js to fetch and load module.
Require JS consists of a small set of plugins which allow us to loading the various kinds of sources like text, Dom Ready, i18n, CSS and loading.
Require JS includes 3 main API functions:-
Define () - This function is used to outline a module. Each module is defined a unique module ID. This module Id is used by Require JS on the runtime.
Require () - This characteristic is used to load dependencies and It is a international feature.
Config () - This function is used to configure the Require JS runtime capability.
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