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Post: 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: SethBreaking Down the Example
constKeyword: Theconstkeyword is used to declare a constant variable. Once you assign a value to a constant variable, you cannot reassign it.- Variable Name:
myNameis 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. - Assignment Operator: The
=symbol is the assignment operator. It assigns the value'Seth'to the variablemyName. - Value:
'Seth'is the value assigned to the variablemyName.
Printing to the Console
After declaring the variable, you can print its value to the console using console.log():
console.log(myName); // Output: SethStoring 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: 11Explanation
- Declaring the Variable:
const myAge = 11;creates a constant variable namedmyAgeand assigns it the value11. - Printing the Variable:
console.log(myAge);outputs the value ofmyAge, which is11, 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: blueExample 2: Declaring a Boolean
const isJavaScriptFun = true;
console.log(isJavaScriptFun); // Output: trueExample 3: Declaring a Number
const numberOfContinents = 7;
console.log(numberOfContinents); // Output: 7Conclusion – 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!
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About the Author: Bernard Aybout (Virii8)
