Comparison operators in JavaScript are used to compare two values and return a Boolean result based on the comparison. They are fundamental for making decisions and controlling the flow of execution in programs.
The == operator checks if two values are equal, performing type coercion if needed.
let x = 5;
let y = 5;
let isEqual = x == y; // true
The != operator checks if two values are not equal, performing type coercion if needed.
let x = 5;
let y = 10;
let isNotEqual = x != y; // true
The === operator checks if two values are strictly equal, meaning they have the same value and type.
let x = 5;
let y = '5';
let isStrictEqual = x === y; // false
The !== operator checks if two values are strictly not equal, meaning they have either different values or different types.
let x = 5;
let y = '5';
let isStrictNotEqual = x !== y; // true
The > operator checks if the left operand is greater than the right operand.
let x = 5;
let y = 10;
let isGreater = x > y; // false
The < operator checks if the left operand is less than the right operand.
let x = 5;
let y = 10;
let isLess = x < y; // true
The >= operator checks if the left operand is greater than or equal to the right operand.
let x = 5;
let y = 5;
let isGreaterOrEqual = x >= y; // true
The <= operator checks if the left operand is less than or equal to the right operand.
let x = 5;
let y = 10;
let isLessOrEqual = x <= y; // true
Comparison operators in JavaScript are used to compare two values and return a Boolean result. These operators are essential for making decisions and controlling the flow of execution in programs. Understanding how each operator works is crucial for writing effective JavaScript code.