Podcast
Questions and Answers
What is the correct syntax for an if statement in JavaScript?
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?
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?
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?
Which JavaScript statement should be used when selecting among multiple blocks of code to be executed?
What is the purpose of a for loop in JavaScript?
What is the purpose of a for loop in JavaScript?
What is hoisting in JavaScript?
What is hoisting in JavaScript?
What does hoisting allow in JavaScript?
What does hoisting allow in JavaScript?
Which keyword was introduced in ES6 to declare variables with block scope?
Which keyword was introduced in ES6 to declare variables with block scope?
What happens if you try to access a variable declared with let before its declaration?
What happens if you try to access a variable declared with let before its declaration?
In JavaScript, what can arrays hold as elements?
In JavaScript, what can arrays hold as elements?
Study Notes
Declaring and Redeclaring Variables
- JavaScript variables are declared with the
varkeyword. - 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.
