JS Statements 🎯

Welcome to the JavaScript Statements tutorial! In this comprehensive guide, we'll explore the fundamental building blocks of JavaScript programming: statements. By the end of this lesson, you'll have a solid understanding of how to write, execute, and debug JavaScript statements. Let's get started!

What are JavaScript Statements? 📝

In the world of programming, a statement is a line of code that performs an action or makes a declaration. JavaScript statements allow us to instruct the browser to perform various tasks, such as creating variables, performing calculations, and making decisions.

Variable Declaration 💡

Let's start with the most basic JavaScript statement: variable declaration. Variables are containers for storing values that we can use later in our code.

javascript

// Declare a variable
let myVariable;

// Assign a value to the variable
myVariable = 5;

// Output the value of the variable
console.log(myVariable); // 5

📝 Note: In JavaScript, we have three ways to declare variables: let, const, and var. We'll cover each of them later in this tutorial.

Arithmetic Operations 💡

Now that we have a variable, let's perform some calculations! JavaScript supports the following arithmetic operations:

Addition (+)
Subtraction (-)
Multiplication (*)
Division (/)
Modulus (%)
Increment (++)
Decrement (--)

javascript

// Arithmetic operations example
let num1 = 5;
let num2 = 3;

// Addition
let sum = num1 + num2; // 8

// Subtraction
let difference = num1 - num2; // 2

// Multiplication
let product = num1 * num2; // 15

// Division
let quotient = num1 / num2; // 1.6666666666666667

// Modulus
let remainder = num1 % num2; // 1

// Increment
num1++; // 6

// Decrement
num1--; // 5

Comparison Operators 💡

Comparison operators allow us to compare two values and determine their relationship. JavaScript supports the following comparison operators:

Equal to (==)
Not equal to (!=)
Greater than (>)
Less than (<)
Greater than or equal to (>=)
Less than or equal to (<=)

javascript

// Comparison operators example
let num1 = 5;
let num2 = 3;

// Equal to
let isEqual = num1 == num2; // false

// Not equal to
let isNotEqual = num1 != num2; // true

// Greater than
let isGreaterThan = num1 > num2; // true

// Less than
let isLessThan = num1 < num2; // false

// Greater than or equal to
let isGreaterThanOrEqual = num1 >= num2; // false

// Less than or equal to
let isLessThanOrEqual = num1 <= num2; // true

Logical Operators 💡

Logical operators allow us to combine multiple conditional statements and make more complex decisions. JavaScript supports the following logical operators:

AND (&&)
OR (||)
NOT (!)

javascript

// Logical operators example
let num1 = 5;
let num2 = 3;

// AND (`&&`)
let isBothGreaterThan3 = (num1 > 3) && (num2 > 3); // true

// OR (`||`)
let isEitherGreaterThan3 = (num1 > 3) || (num2 > 3); // true

// NOT (`!`)
let isNotBothGreaterThan3 = !isBothGreaterThan3; // false

Control Flow Statements 💡

Control flow statements allow us to control the flow of execution in our code. We'll cover the following control flow statements in this tutorial:

if statements
else statements
else if statements
switch statements
Loops (for, while, do-while)

Quiz 🎯

Stay tuned for our next lesson on JavaScript Control Flow Statements! 🚀