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Java Script ( JS )

Lec-1: Introduction

Description

JavaScript is a lightweight, cross-platform, interpreted programming language. JavaScript is developed for creating network-centric applications. It is complementing and integrated with Java. JavaScript is very simple to implement because it is integrated with HTML.

Prerequisite

For this Javascript tutorial, it is assumed that the reader has a basic knowledge of HTML coding.

It would help if the reader had some prior exposure to object-oriented programming concepts and a basic or fundamental idea of creating online applications.

Includes

Videos: 10

Q&A: 26

Exam based Questions:10

Topics Covered

• Scope and how to include JS in HTML

• Data types • Prototype • ES5 & ES6 difference

• Creating objects • Singleton JS • Arrays in JS

For whom

To understand the fundamental functionality of JavaScript to create dynamic web pages and web applications.

Reference books

1. A Smarter Way to Learn JavaScript: The new approach that uses technology to cut your effort in half, by Mark Myers

2. JavaScript and JQuery: Interactive Front-End Web Development, by Jon Duckett

3. Eloquent JavaScript: A Modern Introduction to Programming, by Marijn Haverbeke

4. JavaScript: The Definitive Guide, by David Flanagan

Q & A
Exam Questions

Q1 . What is the 'Strict' mode in JavaScript and how can it be enabled?
Q2 . How will you explain closures in JavaScript? When are they used?
Q3 . Describe the properties of an anonymous function in JavaScript?
Q4 . What is the difference between .call () and apply ()?
Q5 . How can a particular frame be targeted, from a hyperlink, in JavaScript?
Q6 . Write about the errors shown in JavaScript?
Q7 . Explain the upshift () method?
Q8 . Define escape () and escape () functions?
Q9 . What is the decode URI () and encode URI ()?
Q10 . What is names-pacing in JavaScript and how is it used?

• Number
• String
• Boolean
• Object
• Undefined

Negative infinity is a number in JavaScript and can be obtained by dividing a negative number by zero.

undeclared variables that do not exist in the program, it will encounter a runtime error
Declared in the program but are not assigned any value, it returns the undefined value.

The prompt box is a box that allows the user to enter input by providing a text box. Labels and boxes will be provided to enter text or numbers.

"View State" is specific to the page in the session.
"Session State" is specific to user-specific data that can be accessed on all pages in the web application.

=== is called a strict equality operator. When two operands have the same value without any type of conversion, it returns true.

To submit a form using JavaScript use document. Form [0].submit (); Document from [0]. Submit ();

Yes, JavaScript supports automatic type conversion, which is a common type conversion method used by JavaScript developers

There are three types of errors: • Load time errors: Errors that occur when loading web pages, such as incorrect syntax errors, are called load time errors, and they generate errors dynamically. • Runtime errors: errors caused by incorrect use of commands within the HTML language. • Logic errors: These errors occur due to logic errors performed on functions with different operations.

There are two ways to read and write files using JavaScript • Using JavaScript extensions • Using a web page and Active X objects

Following are looping structures in JavaScript: • For • While • do-while loops

Variable types are used to assign numbers to variables, and the same variables can be assigned to strings. Example – • I = 10 • I = “string” This is called variable typing.

The parse Int() function is used to convert numbers between different bases. Parse Int() takes the string to be converted as its first parameter, and the second parameter is the base of the given string. To convert 4F (of base 16) to an integer, the code used will be – parse int (“4F”, 16);

"==" only checks whether the values are equal, and "===" is a stricter equality test.
If the values or types of two variables are different, false is returned.

Since 3 and 2 are integers, they will be added digitally. And since 7 is a string, the concatenation will be completed. So the result will be 57.

To detect the operating system on the client computer, the navigator. Platform string (attribute) should be used.

The NULL value is used to indicate no value or no object. It means there are no objects or empty strings, no valid Boolean values, no numbers, and no array objects.

Undefined value means the • Variable used in the code doesn't exist • Variable is not assigned to any value • Property doesn't exist

• Alert • Confirm and • Prompt

Void (0) is used to prevent page refresh, and the parameter

All variables in the JavaScript are object data types.

The alert box only displays one button, the

When using special characters (such as single quotes, double quotes, apostrophes, and ampersands), please use escape characters (backslashes). Put a backslash before the character to make it appear.

Cookies are small text files stored on the computer. Cookies are created when a user visits a website to store the required information. For example, username details and previously visited shopping cart information.

The pop () method is similar to the shift () method, but the difference is that the Shift method works at the beginning of the array. The pop () method also removes the last element from the given array and returns it. Then change the array called on it.

They are as – • Primitive • Reference types. The basic types are numeric and Boolean data types. Reference types are more complex types, such as strings and dates.

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Course Feature

Category Computer Science
Language English
Price 30.00
Validity 1 Year
Q & A 26
Exam Questions 10
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Java Script ( JS )

Lec-1: Introduction

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Computer Science

1.Introduction

2.Data types & Closure

3.Objects & Arrays

1. Introduction

Java Script ( JS )

Lec-1: Introduction

1.Introduction

2.Data types & Closure

3.Objects & Arrays

1. Introduction

Q1 . What are JavaScript Data Types?

Q2 . What is negative infinity?

Q3 . What are undeclared and undefined variables?

Q4 . What is a prompt box?

Q5 . What is the difference between View State and Session State?

Q6 . What is === operator?

Q7 . Explain how can you submit a form using JavaScript?

Q8 . Does JavaScript support automatic type conversion?

Q9 . What are the different types of errors in JavaScript?

Q10 . Explain how to read and write a file using JavaScript?

Q11 . What are all the looping structures in JavaScript?

Q12 . What is called Variable typing in JavaScript?

Q13 . How can you convert the string of any base to integer in JavaScript?

Q14 . Explain the difference between

Q15 . What would be the result of 3+2+

Q16 . Explain how to detect the operating system on the client machine?

Q17 . What do mean by NULL in JavaScript?

Q18 . What is an undefined value in JavaScript?

Q19 . What are all the types of Pop up boxes available in JavaScript?

Q20 . What is the use of Void (0)?

Q21 . What is the data type of variables in JavaScript?

Q22 . What is the difference between an alert box and a confirmation box?

Q23 . What are escape characters?

Q24 . What are JavaScript Cookies?

Q25 . Explain what is the pop () method in JavaScript?

Q26 . What are the two basic groups of data types in JavaScript?

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