JavaScript Comparison

Comparison operators are used in logical statements to determine equality or difference between variables or values. The result of a comparison is always a boolean value: true or false.

Comparison Operators Table

Here are the comparison operators available in JavaScript:

Equal vs. Strict Equal

The most important part of comparison in JavaScript is understanding the difference between == and ===.

1. Equal (==)

The == operator compares two values for equality after converting them to a common type (type coercion).

let x = 5;
console.log(x == 5);    // true
console.log(x == "5");  // true (string "5" is converted to number 5)

2. Strict Equal (===)

The === operator (also called "identity" or "triple equal") compares both the value and the data type. No conversion happens.

let x = 5;
console.log(x === 5);   // true
console.log(x === "5"); // false (because one is a number and the other is a string)

Relational Operators

These operators are used to compare numeric values (though they also work with strings using alphabetical order).

let age = 18;

console.log(age > 15);  // true
console.log(age < 20);  // true
console.log(age >= 18); // true
console.log(age <= 10); // false

Comparison in Logical Decisions

Comparison operators are most commonly used inside if statements to control the flow of the program.

let hour = 14;

if (hour < 18) {
    console.log("Good day!");
}

Key Points to Remember

• The result of a comparison is always true or false
• == compares values only; === compares values and types
• Relational operators (>, <, etc.) are standard math comparisons
• Comparison operators are the foundation of decision-making in code