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WEB PROGRAMMING 12 - 2nd Quarter > JAVASCRIPT > Flashcards

JAVASCRIPT Flashcards

1
Q

It is lightweight and most commonly used as a part of web pages, whose implementations allow client-side script to interact with the user
and make dynamic pages.

A

JavaScript

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2
Q
  • It is complimentary to and integrated with Java. A very easy to implement because it is integrated with HTML. It is open and cross-platform.
    -a dynamic computer programming language.
A

JavaScript

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3
Q

Why to Learn Javascript?

A
  • Javascript is the most popular programming language in the world and that makes it a programmer’s great choice
    -Javascript is everywhere, it comes installed on every modern web browser and so to learn Javascript you really do not need any special environment setup
  • Javascript helps you create really beautiful and crazy fast websites.
  • JavaScript usage has now extended to mobile app development,desktop app development, and game development.
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4
Q

What is the output of this?

<html>
<body>

<script>
document.write("Hello World!")
</script>

</body>
</html>
A

Hello World!

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5
Q

Enumerate the applications of JavaScript Programming

A
  • Client side validation
  • Manipulating HTML Pages
  • User Notifications
  • Presentations
  • Server Applications
  • Back-end Data Loading
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6
Q

the most common form of the language.
The script should be included in or referenced by an HTML document for the code to be interpreted by the browser.

A

Client-side JavaScript

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7
Q

True or False

The JavaScript code is executed when the user submits the form, and only if all the entries are valid, they would be submitted to the Web Server.

A

True

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8
Q

True or False

JavaScript can be used to trap user-initiated events such as button clicks, link navigation, and other actions that the user initiates explicitly or implicitly.

A

True

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9
Q

Enumerate the Advantages of JavaScript

A
  • Less server interaction
  • Immediate feedback to the visitors
  • Increase interactivity
  • Richer interfaces
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10
Q

You can validate user input before sending the page off to the server.

A

Less server interaction

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11
Q

They don’t have to wait for a page reload to see if they have forgotten to enter something.

A

Immediate feedback to the visitors

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12
Q

You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

A

Increased interactivity

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13
Q

You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.

A

Richer interfaces

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14
Q

What are the limitations of JavaScript

A

-Client-side JavaScript does not allow the reading or writing of files. This has been kept for security reason
-JavaScript cannot be used for networking applications because there is no such support available.
-JavaScript doesn’t have any multi-threading or multiprocessor capabilities.

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15
Q

True or False

  • JavaScript can be implemented using JavaScript statements that are placed within the 
    ...
    HTML tags in a web page.
A

True

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16
Q

True or False

You can place the 

 tags, containing your JavaScript, anywhere within your web page, but it is normally recommended that you should keep it within the <head> tags.
A

True

17
Q

Enumerate the two important attributes in script tags

A

-Language
- Type

18
Q

This attribute specifies what scripting language you are using. Typically, its value will be JavaScript.

A

Language

19
Q

This attribute is what is now recommended to indicate the scripting language in use and its value should be set to “text/javascript”.

A

Type

20
Q

JavaScript ignores spaces, tabs, and newlines that appear in JavaScript programs.

A

Whitespace and Line Breaks

21
Q

Simple statements in JavaScript are generally followed by a semicolon character, just as they are in C, C++, and Java.

A

Semicolons are Optional

22
Q

JavaScript is a _______________ language. This means that the language keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters.

A

case-sensitive / case sensitivity

23
Q

What is the comment in JavaScript?

A

// and /* */

24
Q

What is the external file from HTML to JavaScript?

A 















25










Q













what three primitive data types allow you to work with JavaScript?


















A













➢ Numbers, eg. 123, 120.50 etc.
➢ Strings of text e.g. “This text string” etc.
➢ Boolean e.g. true or false.















26










Q













JavaScript also defines two trivial data
types,_____ and _______ , each of which defines only a single value.


















A













null and undefined















27










Q















True or False


JavaScript supports a composite data type known as object.




















A













True















28










Q















True or False


-Before you use a variable in a JavaScript program, you must declare it. Variables are declared with the var keyword as follows.




















A













True















29










Q















True or False


Storing a value in a variable is called variable initialization. You can do variable initialization at the time of variable creation or at a later point in time when you need that variable


<script>
var name = "Ali";
var money;
money = 2000.50;
</script>




















A













True















30










Q















True or False


  • Use the var keyword only for declaration or initialization, once for the life of any variable name in a document. You should not re- declare same variable twice.
    -JavaScript is untyped language. This means that a JavaScript variable can hold a value of any data type.




















A













True















31










Q















True or False


-Unlike many other languages, you don’t have to tell JavaScript during variable declaration what type of value the variable will hold.
- The value type of a variable can change during the execution of a program and JavaScript takes care of it automatically.




















A













True















32










Q













What are the variable scope in JavaScript?


















A













-Global variables
- Local Variables















33










Q













it can be defined anywhere in your JavaScript code.


















A













Global Variables















34










Q













The variable that will be visible only within a function where it is defined. Function parameters are always local to that function.


















A













Local Variables















35










Q













Enumerate the JavaScript operator


















A













    

  • Arithmetic Operators
    • 

  • Comparison Operators
    • 

  • Logical (or Relational) Operators
    • 

  • Assignment Operators
    • 

  • Conditional (or ternary) Operators
    • 































WEB PROGRAMMING 12 - 2nd Quarter (4 decks)


























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