Intro to JS: Variables & Values

What is the primary purpose of a scripting language like JavaScript?

• To create operating systems

• To write small programs or scripts for common tasks

• To design hardware components

• To manage databases

Which of the following statements correctly declares a variable in JavaScript?

• `int number = 5;`

• `var number = 5;`

• `let number = 5;`

• `const number = 5;`

Explain the difference between a variable and a value in JavaScript.

• A variable is a fixed number, while a value can change.

• A variable is a signifier that points to a value, which is the actual data.

• A variable is a type of data, while a value is a function.

• A variable is a string, while a value is a number.

What is the output of the following JavaScript code? ```javascript var x = 10; var y = 5; console.log(x + y); ```

• 5

• 10

• 15

• 50

Why is JavaScript considered a loosely typed language?

• Because it requires explicit type declarations for variables

• Because it automatically determines the type of a variable based on its value

• Because it does not support data types

• Because it only supports string and number types

Given the following code, what will be the output? ```javascript var greeting = "Hello, "; var name = "Alice"; console.log(greeting + name); ```

• Hello,

• Alice

• Hello, Alice

• greeting + name

Consider the following scenario: You need to store a user's age and name in a JavaScript program. Which data types would you use for each, and why?

• Use a String for age and a Number for name, because age is a sequence of characters.

• Use a Number for age and a String for name, because age is a numerical value and name is a sequence of characters.

• Use a Boolean for both, because they are simple data types.

• Use an Array for both, because they can store multiple values.

What is the significance of using a REPL environment like Repl.it for learning JavaScript?

• It allows for the creation of complex web applications.

• It provides a platform to experiment and try out new ideas interactively.

• It is the only way to run JavaScript code.

• It automatically optimizes JavaScript code for performance.