Introduction to JavaScript

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Questions and Answers

Which of the following is the correct way to include JavaScript code directly within an HTML document?

<javascript> // JavaScript code </javascript>
<embed> // JavaScript code </embed>
<js> // JavaScript code </js>
<script> // JavaScript code </script> (correct)

Which of the following is NOT a component that a JavaScript statement may contain?

Paragraphs (correct)
Keywords
Values
Operators

Which of the following keywords is used to declare a variable in JavaScript that cannot be reassigned?

dynamic
const (correct)
var
let

What does the `parseInt()` function in JavaScript do?

Converts a string to an integer (A)

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What is the purpose of the `return` statement in a JavaScript function?

To stop the execution of the function and optionally return a value (B)

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JavaScript code can only be included in an HTML document directly, not from an external file.

False (B)

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In JavaScript, `total` and `Total` are treated as the same variable.

False (B)

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Using mixed data types in JavaScript operations always leads to predictable and desired outcomes.

False (B)

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The `const` keyword in JavaScript allows you to reassign a new value to the declared variable after its initial assignment.

False (B)

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In JavaScript, function declarations can be called before they are defined in the code due to a feature called hoisting.

True (A)

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Which of the following best describes a JavaScript object?

A way to store multiple pieces of related data in a structured format. (D)

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Which of the following is used to access object methods?

Dot notation (C)

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What is the correct way to add a new property to an existing JavaScript object?

Both A and C (A)

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Which of the following is a characteristic of JavaScript objects?

They are dynamic, allowing properties to be added and removed. (D)

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Using the JavaScript Date object, which method returns the month as an index number?

<code>getMonth()</code> (A)

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In JavaScript, an object is used to store multiple, unrelated pieces of data.

False (B)

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A car object can have attributes like color, brand, model and speed.

True (A)

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In JavaScript, object property values can only be referenced using dot notation syntax.

False (B)

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JavaScript objects are static, meaning you can't add new properties after the object is created.

False (B)

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The JavaScript built-in Array object stores items in individual elements that are numbered starting at 1.

False (B)

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Which of the following determines the execution flow of a program?

Control structures (C)

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What is the purpose of the `if` statement in JavaScript?

To execute code only when a condition is true. (C)

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In a `switch` statement, what happens when a `break` keyword is encountered?

The <code>switch</code> statement exits, and the program continues with the next statement after the <code>switch</code> block. (D)

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Which part of a `for` loop is responsible for updating the loop counter?

Modifier (C)

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What is the key difference between a `while` loop and a `do...while` loop in JavaScript?

A <code>do...while</code> loop always executes at least once, while a <code>while</code> loop might not execute at all. (C)

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Control structures determine the execution flow of a program.

True (A)

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The `if` statement executes code regardless of whether the condition is true or false.

False (B)

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A `switch` statement can be used to perform different actions based on different conditions.

True (A)

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In a `switch` block, omitting the `break` statement will prevent the next `case` from being executed, even if it matches.

False (B)

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A `do...while` loop evaluates the condition before executing the statements within the loop.

False (B)

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Flashcards

What is JavaScript?

A language embedded in web browsers that enables client-side scripting, improving web page responsiveness.

Including JavaScript

JavaScript can be included directly within HTML using <script> tags or via external .js files referenced in the HTML.

JavaScript Statement

A series of instructions executed by the JavaScript engine.

JavaScript Function

A named block of code designed to perform a particular task, and it returns a final single value.

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Scope in JavaScript

Determines where a variable is accessible. Can be global or local.

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Writing to HTML Elements

Writes dynamic content into an HTML element using its ID.

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Keywords in JavaScript

Words with special significance in JavaScript.

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JavaScript Variables

Values that can be changed during the execution of a script.

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Global Scope

Variables declared outside a function; accessible throughout the script.

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parseInt()

Converts a string to an integer in JavaScript.

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What is an Object?

A way to store multiple pieces of related data in a structured format; a container for grouping information.

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Object Attributes (Properties)

Characteristics of an object, like color, brand, or model.

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Object Behaviors (Methods)

Actions an object can perform, such as start(), stop(), or accelerate().

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Object Dot Notation

Access an object's property: objectName.propertyName

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JavaScript Array

A built-in JavaScript object that stores multiple values in a single variable; uses square brackets [].

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Object Bracket Notation

A way to reference object properties, using brackets and quotes: objectName['propertyName'].

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Prototype Inheritance

Built-in objects inherit properties and methods from Object.prototype.

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getFullYear()

Built-in Date object method that retrieves the year as a four-digit number (yyyy).

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getMonth()

Built-in Date object method that retrieves the month as an index number, 0-11.

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Extending Objects

Objects can be modified by adding new properties, modifying existing ones, and removing unneeded properties.

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What are Control Structures?

Control structures determine the order in which statements are executed, allowing for conditional execution and looping.

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What is an `if` statement?

The if statement executes a block of code only if a specified condition is true.

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What does `else` do in an `if` statement?

Extends the if statement by providing an alternative block of code to execute if the condition is false.

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What is a `switch` statement?

A control flow statement that allows executing different blocks of code based on the value of a variable or expression.

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What is a `while` loop?

A loop that executes a block of code repeatedly as long as a specified condition is true.

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Extending If with Else

Adds an alternative execution path when the condition is false in an if statement.

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For loop

A loop structure specifies an initializer, a condition, and a modifier to control the number of iterations to exit the loop.

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Do While Loop

A loop evaluates the condition after the code block is executed at least once.

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Break Statement

Exits a loop prematurely when a specified condition is met.

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Continue Statement

Skips the current iteration and proceeds with the next one.

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Study Notes

Control structures determine the execution flow of a program.
Control structures facilitate conditional execution and looping.
Control structures enable decision-making and repetitive execution.
Control structures are essential for efficient coding and logic building.

Branch If

The if statement evaluates a condition.
The if statement executes code only if the condition is true.
Syntax for if statement:

if (condition) {
  // block of code to be executed if the condition is true
}

Example:

if (hour < 18) {
  greeting = "Good day";
}

Branch Alternatives (If/Else)

Extending if with else adds an alternative execution path for when the condition is false.
Syntax for if/else statement:

if (condition) {
  // block of code to be executed if the condition is true
} else {
  // block of code to be executed if the condition is false
}

Example:

if (hour < 18) {
  greeting = "Good day";
} else {
  greeting = "Good evening";
}

Branch Alternatives (Multiple Branches)

Multiple branches use subsequent conditional if tests at the start of each else statement block.
Syntax for multiple branch if/else if statement:

if (condition) {
  // block of code to be executed if the condition is true
} else if (condition) {
  // block of code to be executed if the condition is false
}

Example:

if (hour < 18) {
  greeting = "Good day";
} else if (hour < 24) {
  greeting = "Good evening";
}

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Introduction to JavaScript

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Podcast

Questions and Answers

Which of the following is the correct way to include JavaScript code directly within an HTML document?

Which of the following is NOT a component that a JavaScript statement may contain?

Which of the following keywords is used to declare a variable in JavaScript that cannot be reassigned?

What does the parseInt() function in JavaScript do?

What is the purpose of the return statement in a JavaScript function?

JavaScript code can only be included in an HTML document directly, not from an external file.

In JavaScript, total and Total are treated as the same variable.

Using mixed data types in JavaScript operations always leads to predictable and desired outcomes.

The const keyword in JavaScript allows you to reassign a new value to the declared variable after its initial assignment.

In JavaScript, function declarations can be called before they are defined in the code due to a feature called hoisting.

Which of the following best describes a JavaScript object?

Which of the following is used to access object methods?

What is the correct way to add a new property to an existing JavaScript object?

Which of the following is a characteristic of JavaScript objects?

Using the JavaScript Date object, which method returns the month as an index number?

In JavaScript, an object is used to store multiple, unrelated pieces of data.

A car object can have attributes like color, brand, model and speed.

In JavaScript, object property values can only be referenced using dot notation syntax.

JavaScript objects are static, meaning you can't add new properties after the object is created.

The JavaScript built-in Array object stores items in individual elements that are numbered starting at 1.

Which of the following determines the execution flow of a program?

What is the purpose of the if statement in JavaScript?

In a switch statement, what happens when a break keyword is encountered?

Which part of a for loop is responsible for updating the loop counter?

What is the key difference between a while loop and a do...while loop in JavaScript?

Control structures determine the execution flow of a program.

The if statement executes code regardless of whether the condition is true or false.

A switch statement can be used to perform different actions based on different conditions.

In a switch block, omitting the break statement will prevent the next case from being executed, even if it matches.

A do...while loop evaluates the condition before executing the statements within the loop.

Flashcards

What is JavaScript?

Including JavaScript

JavaScript Statement

JavaScript Function

Scope in JavaScript

Writing to HTML Elements

Keywords in JavaScript

JavaScript Variables

Global Scope

parseInt()

What is an Object?

Object Attributes (Properties)

Object Behaviors (Methods)

Object Dot Notation

JavaScript Array

Object Bracket Notation

Prototype Inheritance

getFullYear()

getMonth()

Extending Objects

What are Control Structures?

What is an if statement?

What does else do in an if statement?

What is a switch statement?

What is a while loop?

Extending If with Else

For loop

Do While Loop

Break Statement

Continue Statement

Study Notes

Branch If

Branch Alternatives (If/Else)

Branch Alternatives (Multiple Branches)

Studying That Suits You

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What does the `parseInt()` function in JavaScript do?

What is the purpose of the `return` statement in a JavaScript function?

In JavaScript, `total` and `Total` are treated as the same variable.

The `const` keyword in JavaScript allows you to reassign a new value to the declared variable after its initial assignment.

What is the purpose of the `if` statement in JavaScript?

In a `switch` statement, what happens when a `break` keyword is encountered?

Which part of a `for` loop is responsible for updating the loop counter?

What is the key difference between a `while` loop and a `do...while` loop in JavaScript?

The `if` statement executes code regardless of whether the condition is true or false.

A `switch` statement can be used to perform different actions based on different conditions.

In a `switch` block, omitting the `break` statement will prevent the next `case` from being executed, even if it matches.

A `do...while` loop evaluates the condition before executing the statements within the loop.

What is an `if` statement?

What does `else` do in an `if` statement?

What is a `switch` statement?

What is a `while` loop?