Operators and Expressions

Operators in JavaScript:

Operators are used to perform operations on variables and values. They allow you to work with data in various ways.

Arithmetic Operators: These operators are used for basic math operations.
- + (Addition): Adds two numbers.
- - (Subtraction): Subtracts the second number from the first.
- * (Multiplication): Multiplies two numbers.
- / (Division): Divides the first number by the second.
- % (Modulus): Returns the remainder of the division of the first number by the second.
Example:
```
let x = 10;
let y = 5;
let sum = x + y; // Result: 15
let difference = x - y; // Result: 5
let product = x * y; // Result: 50
let quotient = x / y; // Result: 2
let remainder = x % y; // Result: 0
```
Comparison Operators: These operators compare two values and return a Boolean result.
- == (Equal): Checks if two values are equal.
- === (Strict Equal): Checks if two values are equal in both value and type.
- != (Not Equal): Checks if two values are not equal.
- > (Greater Than): Checks if the left value is greater than the right.
- < (Less Than): Checks if the left value is less than the right.
- >= (Greater Than or Equal): Checks if the left value is greater than or equal to the right.
- <= (Less Than or Equal): Checks if the left value is less than or equal to the right.
Example:
```
let a = 5;
let b = "5";
let c = 7;
console.log(a == b); // true (values are equal)
console.log(a === b); // false (values are equal, but types are different)
console.log(a != c); // true (values are not equal)
console.log(a > c); // false (a is not greater than c)
```

Logical Operators: These operators are used to perform logical operations.

&& (Logical AND): Returns true if both conditions are true.
|| (Logical OR): Returns true if at least one condition is true.
! (Logical NOT): Negates a condition.

Example:

let isTrue = true;
let isFalse = false;
console.log(isTrue && isFalse); // false (both conditions are not true)
console.log(isTrue || isFalse); // true (at least one condition is true)
console.log(!isTrue); // false (negation of true)

Assignment Operators: These operators assign values to variables.
- = (Assignment): Assigns a value to a variable.
- += (Addition Assignment): Adds the right value to the variable's current value.
- -= (Subtraction Assignment): Subtracts the right value from the variable's current value.
- *= (Multiplication Assignment): Multiplies the variable's current value by the right value.
- /= (Division Assignment): Divides the variable's current value by the right value.
Example:
```
let num = 10;
num += 5; // num is now 15
num -= 3; // num is now 12
num *= 2; // num is now 24
num /= 4; // num is now 6
```

Concatenation Operator: The + operator can also be used for string concatenation.

Example:

let name = "John";
let greeting = "Hello, " + name + "!";
console.log(greeting); // Result: "Hello, John!"

These operators are essential for performing various operations and calculations in JavaScript. Understanding them is crucial for developing applications in Node.js or any other JavaScript-based environment.

Let's cover expressions in JavaScript:

Expressions in JavaScript:

An expression is a piece of code that produces a value. It can be a single value, a variable, or a combination of values and operators.

Basic Expressions:

Arithmetic Expressions: Combine numbers and arithmetic operators to produce numeric results.

Example:

let x = 10;
let y = 5;
let sum = x + y; // Result: 15
let product = x * y; // Result: 50

String Expressions: Combine strings using the + operator for concatenation.

Example:

let name = "John";
let greeting = "Hello, " + name + "!";
console.log(greeting); // Result: "Hello, John!"

Comparison Expressions:

Comparison Expressions: Use comparison operators to compare values, which result in true or false.
Example:
```
let a = 5;
let b = 7;
let isGreaterThan = a > b; // Result: false
```

Logical Expressions:

Logical Expressions: Combine logical values (true or false) using logical operators.

Example:

let isTrue = true;
let isFalse = false;
let bothTrue = isTrue && isTrue; // Result: true

Function Call Expressions:

Function Call Expressions: Call a function to produce a result.

Example:

function add(x, y) {
  return x + y;
}

let result = add(3, 4); // Result: 7

Complex Expressions:

Complex Expressions: Expressions can become more complex by combining multiple operators and values.
Example:
```
let complexExpression = (5 * 2 + 3) / 4; // Result: 3.25
```

Assignment Expressions:

Assignment Expressions: Assign the result of an expression to a variable.

Example:

let x = 5;
x = x + 3; // Assigns the result of the expression (5 + 3) to x

Expressions are the building blocks of JavaScript. They allow you to perform calculations, manipulate data, and make decisions in your code. Understanding how expressions work is essential for effective programming in Node.js and JavaScript in general.

Operators V/S Expressions

The differences between operators and expressions in JavaScript:

Feature	Operators	Expressions
Purpose	Perform operations on variables and values	Combinations of variables, values, and operators that produce a value.
Examples	`+`, `-`, `*`, `/`, `%`, `==`, `===`, `!=`, `>`, `<`, `>=`, `<=`, `&&`, `
Return Value	Typically returns a value or Boolean result	Produces a value (can be a number, string, Boolean, etc.)
Usage	Used to perform specific operations on variables and values	Formed by combining operators and variables/values to create complex computations.
Assignment Operators	Used to assign values to variables (e.g., `=` for assignment, `+=` for addition assignment)	Not used for assignment; expressions do not modify variables.
Logical Operations	Used to perform logical operations (e.g., `&&` for AND, `
Example	`let sum = x + y;`	`let result = (a + b) * c;`

Operators are used to perform specific operations on variables and values, such as arithmetic, comparison, and logical operations. They typically return a value or Boolean result.

Expressions, on the other hand, are combinations of variables, values, and operators that produce a value. They are not used for assignment or logical operations but are used to create complex computations by combining operators and values or variables.

Operators in JavaScript:​

Expressions in JavaScript:​

Operators V/S Expressions​

Operators in JavaScript:

Expressions in JavaScript:

Operators V/S Expressions