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Questions and Answers
What is the primary purpose of JavaScript in web development?
What is the primary purpose of JavaScript in web development?
JavaScript is primarily used to create interactive and dynamic content on web pages.
List two key features that distinguish JavaScript from Java.
List two key features that distinguish JavaScript from Java.
JavaScript is an interpreted language and has a more relaxed syntax compared to Java.
How does JavaScript integrate with HTML?
How does JavaScript integrate with HTML?
JavaScript can be directly embedded into HTML pages to enhance interactivity.
What method would you use to change HTML content in JavaScript?
What method would you use to change HTML content in JavaScript?
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Explain the significance of JavaScript being a client-side scripting language.
Explain the significance of JavaScript being a client-side scripting language.
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Why is JavaScript considered case-sensitive?
Why is JavaScript considered case-sensitive?
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What does it mean that JavaScript is open-source?
What does it mean that JavaScript is open-source?
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Identify one way in which JavaScript is platform-independent.
Identify one way in which JavaScript is platform-independent.
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What will be the value of let sum = 10 + 5
in JavaScript?
What will be the value of let sum = 10 + 5
in JavaScript?
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If let difference = 10 - 5
, what does difference
hold?
If let difference = 10 - 5
, what does difference
hold?
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What does the expression let product = 10 * 5
evaluate to?
What does the expression let product = 10 * 5
evaluate to?
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Calculate the result of let quotient = 10 / 5
.
Calculate the result of let quotient = 10 / 5
.
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What is the value of let remainder = 10 % 3
?
What is the value of let remainder = 10 % 3
?
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Identify one type of primary expression in JavaScript.
Identify one type of primary expression in JavaScript.
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How are object initializers represented in JavaScript?
How are object initializers represented in JavaScript?
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What symbol is used to denote array initializers in JavaScript?
What symbol is used to denote array initializers in JavaScript?
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What will be the output of the given code if the score is 35?
What will be the output of the given code if the score is 35?
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Explain the primary function of an if-statement in JavaScript.
Explain the primary function of an if-statement in JavaScript.
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How does an else if statement differ from a standard if statement?
How does an else if statement differ from a standard if statement?
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What is the purpose of using a switch statement in JavaScript?
What is the purpose of using a switch statement in JavaScript?
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In the provided if-else example, what would happen if the score was exactly 50?
In the provided if-else example, what would happen if the score was exactly 50?
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What is a function expression in JavaScript and how is it defined?
What is a function expression in JavaScript and how is it defined?
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Explain the difference between dot notation and bracket notation for property access in JavaScript.
Explain the difference between dot notation and bracket notation for property access in JavaScript.
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What is an invocation expression in JavaScript?
What is an invocation expression in JavaScript?
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Describe how to create a new object using an object creation expression.
Describe how to create a new object using an object creation expression.
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How does an if-statement function in JavaScript?
How does an if-statement function in JavaScript?
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What will the expression obj.x
return given var obj = {x: 1, y: 2};
?
What will the expression obj.x
return given var obj = {x: 1, y: 2};
?
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Provide an example of using bracket notation to access an array element.
Provide an example of using bracket notation to access an array element.
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What is the purpose of the new
keyword in JavaScript object creation?
What is the purpose of the new
keyword in JavaScript object creation?
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What does the continue
statement do in a loop?
What does the continue
statement do in a loop?
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How do you declare an array in JavaScript?
How do you declare an array in JavaScript?
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What is the purpose of the push()
method in an array?
What is the purpose of the push()
method in an array?
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How can you access an element in an array?
How can you access an element in an array?
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What is a JavaScript function?
What is a JavaScript function?
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What happens when you change the first element of an array like cars[0] = "Toyota";
?
What happens when you change the first element of an array like cars[0] = "Toyota";
?
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In JavaScript, how would you output an array's contents to an HTML element?
In JavaScript, how would you output an array's contents to an HTML element?
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What does the syntax of a JavaScript function generally include?
What does the syntax of a JavaScript function generally include?
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Study Notes
Overview of JavaScript
- High-level, interpreted, and object-based programming language.
- Core technology of the World Wide Web, along with HTML and CSS.
- Primarily used for creating interactive and dynamic web content.
Features of JavaScript
- Cross-platform, lightweight, and open-source language.
- Supports both client-side and server-side scripting.
- Responsible for interactivity and responsiveness of web pages.
- Interpreted within web browsers like Chrome, Firefox, and Internet Explorer.
- Shares syntax and structure with the C programming language.
- Case-sensitive with no specific hardware or OS dependency; runs inside HTML documents.
- Can be directly embedded into HTML pages.
Comparison: JavaScript vs. Java
- JavaScript is interpreted; Java is compiled.
- JavaScript has more flexible syntax and looser data types; Java requires strict typing.
- Functions are the main construct in JavaScript, while classes are prominent in Java.
JavaScript HTML Methods
-
getElementById()
is a commonly used method for interacting with HTML elements.
JavaScript Arithmetic Operators
- Addition:
let sum = 10 + 5;
results insum
being 15. - Subtraction:
let difference = 10 - 5;
results indifference
being 5. - Multiplication:
let product = 10 * 5;
results inproduct
being 50. - Division:
let quotient = 10 / 5;
results inquotient
being 2. - Modulus:
let remainder = 10 % 3;
results inremainder
being 1.
JavaScript Expressions
- An expression is a code unit that evaluates to a value.
- Types of expressions include:
- Primary Expressions: Simple literals, variable references, and keywords.
- Object and Array Initializers: Create objects or arrays using literal notation.
- Function Definition Expressions: Define functions returning a newly defined function.
- Property Access Expressions: Access object properties or array elements using dot or bracket notation.
- Invocation Expressions: Call functions using their syntax.
- Object Creation Expressions: Create instances using the
new
keyword.
Control Structures in JavaScript
-
if
statement evaluates a condition and executes based on its truthiness. -
if-else
statement executes alternative blocks based on a condition. -
switch
statement selects among multiple blocks based on different conditions.
Loop Control Statements
-
continue
statement skips the current iteration and continues the loop. - Loops can encompass various types, allowing iteration over elements.
Arrays in JavaScript
- An array can store multiple values in a single variable.
- Example:
const cars = ["Saab", "Volvo", "BMW"];
- Accessing elements by index is straightforward, e.g.,
cars[0]
for the first element. - Adding elements is commonly done with the
push()
method, e.g.,fruits.push("Lemon");
.
JavaScript Functions
- Functions encapsulate code for specific tasks and are invoked when needed.
- Defined using the
function
keyword followed by a name and parameters if required. - Example of creating a function:
var sum = function(x, y) { return x + y; };
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Description
This quiz covers the basics of JavaScript, a high-level, interpreted programming language essential for web development. It explores its core features and functionalities that enable the creation of interactive and dynamic web content. Perfect for beginners looking to understand the fundamentals of this versatile language.