# JavaScript Operators: The Simple Guide to Making Your Code "Do Things" # What are Operators? In simple terms, an operator is a special symbol used to perform operations on values and variables. For example, in `5 + 2`, the `+` is the operator. It tells JavaScript: "Take these two numbers and add them together." ## 1\. Arithmetic Operators (The Math Stuff) These are the ones you already know from school. They allow you to perform basic calculations. * `+` (Addition): Adds values. * `-` (Subtraction): Subtracts values. * `*` (Multiplication): Multiplies values. * `/` (Division): Divides one value by another. * `%` (Remainder/Modulo): Gives you what is left over after division. **Console Example:** ```javascript let apples = 10; let friends = 3; console.log(apples + 5); // 15 console.log(apples * 2); // 20 console.log(apples % friends); // 1 (Because 3 goes into 10 three times, with 1 left over) ``` ## 2\. Assignment Operators These are used to **set** or **update** the value of a variable. * `=` : The basic assignment (Sets `x` to `5`). * `+=` : Adds a value to the current variable and updates it. * `-=` : Subtracts a value from the current variable and updates it. **Console Example:** ```javascript let score = 10; score += 5; // Same as: score = score + 5 console.log(score); // 15 ``` ## 3\. Comparison Operators We use these to compare two values. The result is always **True** or **False**. * `>` and `<` : Greater than and less than. * `==` : Equal to (checks the value only). * `===` : **Strict** equal to (checks the value AND the data type). ### The Big Difference: `==` vs `===` This is a common trap for beginners. * `5 == "5"` is **true** because JavaScript tries to be "helpful" and ignores that one is a number and one is text. * `5 === "5"` is **false** because they are different types. **Always use** `===` **to avoid bugs!** ## **4\. Logical Operators** These help us combine multiple conditions together. * `&&` (AND): True only if **both** sides are true. * `||` (OR): True if **at least one** side is true. * `!` (NOT): Flips the value (True becomes False). ![truth table for logical operators, AI generated](https://encrypted-tbn2.gstatic.com/licensed-image?q=tbn:ANd9GcT3zwcXdCYbwsjdcbxyfobdxfRr9rzdxxflbbgcGgjw6UEBRyHFiIsTWhkvbi-mOLP1ydIUTCJXGJjyVNNhpfJiOZTQhJDVrfrZmVmvpGwAA_9M5Qs align="center") **Console Example:** ```javascript let isSunny = true; let hasFreeTime = true; if (isSunny && hasFreeTime) { console.log("Go for a walk!"); } ``` * * * ## Quick Summary Table

Category

Symbols

Use Case

Arithmetic

+, -, *, /, %

Doing math

Comparison

==, ===, >, <

Comparing values

Logical

&&, `

Assignment

=, +=, -=

Storing or changing values