JS Comparison and Logical Operators
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JS Comparison and Logical Operators
In JavaScript, there are several comparison operators and logical operators that you can use to compare values and create Boolean expressions.
Comparison operators:
- == : Equal to
- === : Equal to (strict equality, compares types as well)
- != : Not equal to
- !== : Not equal to (strict inequality, compares types as well)
- < : Less than
- > : Greater than
- <= : Less than or equal to
- >= : Greater than or equal to
Examples:
const x = 5;
const y = 10;
console.log(x == y); // false
console.log(x != y); // true
console.log(x < y); // true
console.log(x > y); // false
console.log(x <= y); // true
console.log(x >= y); // false
Logical operators:
- && : And (returns true if both operands are true)
- || : Or (returns true if at least one operand is true)
- ! : Not (reverses the Boolean value of an expression)
Examples:
const x = 5;
const y = 10;
const z = 15;
console.log(x < y && y < z); // true
console.log(x > y || y > z); // false
console.log(!(x > y)); // true
Note that the && and || operators use short-circuit evaluation. This means that if the first operand of && is false, or the first operand of || is true, the second operand is not evaluated. This can be useful for optimizing code and avoiding unnecessary computations.
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