JavaScript comparison

JavaScript comparison operators are used to compare two values and return a boolean value (true or false) based on the comparison. These operators are essential in controlling the flow of a program, especially in conditional statements like if, while, and for loops.

1. Equality (==) Operator

Compares two values for equality after converting them to a common type (type coercion).

Returns true if the values are equal, otherwise false

10 == "10";     // true (number 10 is coerced to string "10")
20 == 20     // true (number 20 is coerced to number 20)

2. Strict Equality (===)

Compares two values for equality without performing type conversion. Both value and type must be the same.

10 === "10"; // false
10 === 10;   // true

3. Inequality (!=)

Compares two values for inequality without performing type conversion.

10 !== "10"; // true
10 !== 10;   // false

4. Strict Inequality (!==)

Compares two values for inequality without performing type conversion.

10 !== "10"; // true
10 !== 10;   // false

5. Greater Than (>)

Returns true if the left operand is greater than the right operand.

10 > 5; // true

6. Greater Than or Equal To (>=)

Returns true if the left operand is greater than or equal to the right operand.

10 >= 10; // true

7. Less Than (<)

Returns true if the left operand is less than the right operand.

5 < 10; // true

8. Less Than or Equal To (<=)

Returns true if the left operand is less than or equal to the right operand.

5 <= 5; // true

9. Ternary Operator (? :)

A shorthand for an if-else statement. It takes three operands: a condition, a value if true, and a value if false.

const result = (10 > 5) ? "Yes" : "No"; // "Yes"

JavaScript comparison – Interview Questions

JavaScript comparison – Objective Questions (MCQs)