Introduction to JavaScript

What is a variable in JavaScript?

• A variable in JavaScript is a method for defining classes.

• A variable in JavaScript is a type of loop used for iteration.

• A variable in JavaScript is a function that performs calculations.

• A variable in JavaScript is a named container for storing data values.

Which of the following is a data type in JavaScript: String, Number, or Both?

• Array

• Both

• Boolean

• Character

How do you declare a variable in JavaScript?

• You can only use 'let' to declare variables.

• Variables are declared with 'declare'.

• You declare a variable in JavaScript using 'var', 'let', or 'const'.

• You declare a variable using 'define'.

What is the purpose of an if statement?

• To create loops for iteration.

• To define functions and methods.

• To declare variables in a program.

• The purpose of an if statement is to control the flow of execution based on a condition.

What does a for loop do?

• A for loop executes a block of code multiple times, once for each item in a sequence.

• A for loop creates a new variable each time it runs.

• A for loop is used to define functions.

• A for loop runs a block of code only once.

What is the difference between let and var?

• 'let' is function-scoped and 'var' is block-scoped.

• The main difference is that 'let' is block-scoped and 'var' is function-scoped.

• 'let' can be redeclared in the same scope, while 'var' cannot.

• Both 'let' and 'var' are globally scoped.

What is a function in JavaScript?

• A function in JavaScript is a reusable block of code that performs a specific task.

• A function in JavaScript is a method for creating objects.

• A function in JavaScript is a data structure that holds values.

• A function in JavaScript is a type of variable.

What is the scope of a variable?

• The scope of a variable is the region of the program where the variable is defined and can be accessed.

• The scope of a variable is the memory location where the variable is stored.

• The scope of a variable is the data type of the variable.

• The scope of a variable is the time duration for which the variable exists.

How do you call a function in JavaScript?

• function: name()

• callFunction()

• functionName()

• function call()

What is the output of console.log(typeof 42)?

• boolean

• undefined

• string

• number