JavaScript Logical Operators

Logical operators are essential in JavaScript for combining multiple conditions and making decisions based on boolean values (true or false). This guide provides an in-depth look at the three primary logical operators: AND, OR, and NOT.

Key Concepts

1. Boolean Values: Logical operators operate on boolean values (true or false).
2. Logical Operators:
   • AND (&&): Returns true if both operands are true.
   • OR (||): Returns true if at least one operand is true.
   • NOT (!): Returns true if the operand is false (inverts the value).

Logical Operators Explained

1. AND Operator (&&)

• Usage: Checks if both conditions are true.

Example:

let a = true;
let b = false;
console.log(a && b); // Output: false

2. OR Operator (||)

• Usage: Checks if at least one condition is true.

Example:

let a = true;
let b = false;
console.log(a || b); // Output: true

3. NOT Operator (!)

• Usage: Inverts the boolean value.

Example:

let a = true;
console.log(!a); // Output: false

Truth Tables

Understanding how these operators work can be simplified with truth tables:

AND Truth Table (&&)

OR Truth Table (||)

NOT Truth Table (!)

Conclusion

Logical operators are fundamental in controlling the flow of execution in JavaScript. Mastering their use allows developers to create more complex and functional programs.