JavaScript Basics (2)

What keyword is used to define a constant in JavaScript?

• let

• var

• const

• def

Which keyword was introduced in ES6 to declare block-scoped variables?

• var

• let

• const

• function

Which of the following is true about variables declared with `const`?

• They can be redeclared

• They cannot be reassigned

• They are automatically global

• They have function scope

What is the difference between `let` and `var` in JavaScript?

• `let` variables can be redeclared, `var` cannot

• `var` has block scope, `let` has global scope

• `let` has block scope, `var` has function scope

• `var` cannot be reassigned, `let` can

What is a basic difference between JavaScript and PHP in conditional statements?

• PHP uses `elseif`, JavaScript uses `else if`

• JavaScript uses `elseif`, PHP uses `else if`

• Both use `elseif`

• Both use `else if`

How do you declare a simple function in JavaScript?

• function sayHello();

• sayHello function() {}

• function sayHello() {}

• def function sayHello() {}

How do you call a function named `sayHello` in JavaScript?

• call sayHello();

• sayHello();

• execute sayHello();

• invoke sayHello();

What is a parameter in a JavaScript function?

• A value that is returned from a function

• A variable used inside the function

• An argument passed into the function

• A placeholder in the function definition

How do you pass arguments to a function in JavaScript?

• By declaring them inside the function

• By writing them inside the parentheses during the function call

• By returning them from another function

• By using them as variables inside the function

Which of the following is a correct way to declare a function with parameters?

• function calculateArea(width, height) {}

• calculateArea function(width, height) {}

• def function calculateArea(width, height) {}

• var function calculateArea(width, height) {}