Introduction to JavaScript – Create a Variable: const

Introduction to JavaScript – Using Variables with const

Introduction

In this lesson, we’ll explore how to create and use variables in JavaScript using the const keyword. Variables are essential in programming as they store data values that can be used and manipulated throughout your code.

What is a Variable?

A variable in JavaScript is a container for storing data values. Think of it as a labeled box where you can put your information, and you can retrieve or change this information later.

Declaring a Constant Variable – Introduction to JavaScript variables with const

When you want to create a variable that holds a value that should not change, you use the const keyword. Let’s see an example:

const myName = 'Seth';
console.log(myName); // Output: Seth

Breaking Down the Example

1. const Keyword: The const keyword is used to declare a constant variable. Once you assign a value to a constant variable, you cannot reassign it.
2. Variable Name: myName is the name of the variable. Notice the naming style called camelCase, where the first letter is lowercase, and each subsequent word starts with a capital letter. This is a common convention in JavaScript.
3. Assignment Operator: The = symbol is the assignment operator. It assigns the value 'Seth' to the variable myName.
4. Value: 'Seth' is the value assigned to the variable myName.

Printing to the Console

After declaring the variable, you can print its value to the console using console.log():

console.log(myName); // Output: Seth

Storing Different Data Types – Introduction to JavaScript variables with const

You can store various types of data in variables, such as numbers, strings, booleans, and more. Here’s an example with a number:

const myAge = 11;
console.log(myAge); // Output: 11

Explanation

1. Declaring the Variable: const myAge = 11; creates a constant variable named myAge and assigns it the value 11.
2. Printing the Variable: console.log(myAge); outputs the value of myAge, which is 11, to the console.

Practice Exercise

Now, it’s your turn to practice. Try declaring your own constant variables and print their values to the console. Here are a few examples to get you started:

Example 1: Declaring a String

const favoriteColor = 'blue';
console.log(favoriteColor); // Output: blue

Example 2: Declaring a Boolean

const isJavaScriptFun = true;
console.log(isJavaScriptFun); // Output: true

Example 3: Declaring a Number

const numberOfContinents = 7;
console.log(numberOfContinents); // Output: 7

Conclusion – Introduction to JavaScript variables with const

In this lesson, we’ve learned how to declare constant variables using the const keyword in JavaScript. We’ve seen how to assign values to these variables and print them to the console. Remember, const variables hold values that cannot change, making them useful for storing data that should remain constant throughout your program.

Keep practicing with different data types and see how you can use variables in your projects. Happy coding!

Const in JavaScript 🚫【3 minutes】

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