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Declaring and Redeclaring Variables in JavaScript

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Declaring and Redeclaring Variables in JavaScript

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Questions and Answers

What is the correct syntax for an if statement in JavaScript?

if {condition} execute {code}

if condition then code

if (condition) { code } (correct)

if {condition} then {code}

When does the else block of an if...else statement execute in JavaScript?

Regardless of the condition

When the if condition is true

When the if condition is false (correct)

Only on odd numbered conditions

What is the purpose of using else if in JavaScript conditional statements?

To skip the else block and move to the next if condition

To execute another code block if the main condition is true (correct)

To repeat the if condition with different parameters

To combine multiple conditions into one block

Which JavaScript statement should be used when selecting among multiple blocks of code to be executed?

switch statement Signup and view all the answers

What is the purpose of a for loop in JavaScript?

To run a block of code based on a specified condition Signup and view all the answers

What is hoisting in JavaScript?

A behavior where variable and function declarations are moved to the top of their containing scope during compilation Signup and view all the answers

What does hoisting allow in JavaScript?

Use of variables and functions before they are declared Signup and view all the answers

Which keyword was introduced in ES6 to declare variables with block scope?

let & const Signup and view all the answers

What happens if you try to access a variable declared with `let` before its declaration?

ReferenceError Signup and view all the answers

In JavaScript, what can arrays hold as elements?

Strings, numbers, objects, functions, and other arrays Signup and view all the answers

Study Notes

Declaring and Redeclaring Variables

JavaScript variables are declared with the var keyword.
Variables can be assigned values when declared or later.
Redeclared variables do not lose their original value.

JavaScript Operators

Arithmetic Operators

Used to perform arithmetic between variables and/or values.
Examples: +, -, *, /, etc.

Assignment Operators

Used to assign values to JavaScript variables.
Examples: =, +=, -=, *=, /=, etc.

Comparison Operators

Used to determine equality or difference between variables or values.
Examples: ==, !=, ===, !==, >, <, etc.

Logical Operators

Used to determine the logic between variables or values.
Examples: &&, ||, !

Conditional Operator

Used to assign a value to a variable based on a condition.
Syntax: variablename = condition ? value1 : value2

Linking JavaScript to a Web Document

JavaScript can be inserted into the head section of an HTML page using the `

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Description

Learn about declaring and redeclaring variables in JavaScript using the var keyword. Practice assigning values to variables during declaration and understand how redeclaring a variable does not make it lose its original value.