Logical & String Operator in Javascript | Js Operators
Here's an overview of logical and string operators in JavaScript:
Logical Operators
Logical operators evaluate expressions and return a boolean value.
| Operator | Description | Example |
| --- | --- | --- |
| && | Logical AND | `true && true` returns `true` |
| || | Logical OR | `true || false` returns `true` |
| ! | Logical NOT | `!true` returns `false` |
Short-Circuit Evaluation
`&&` evaluates second operand only if first operand is `true`
`||` evaluates second operand only if first operand is `false`
Real-World Examples
```
// Logical AND
if (age ⟩= 18 && country === 'India') {
console.log('Eligible to vote');
}
// Logical OR
if (score ⟩ 90 || extraCredit) {
console.log('Passing grade');
}
// Logical NOT
if (!isValid) {
console.log('Invalid input');
}
```
String Operators
String operators concatenate (join) strings.
| Operator | Description | Example |
| --- | --- | --- |
| + | Concatenation | `'Hello, ' + 'World!'` returns `'Hello, World!'` |
| += | Concatenation Assignment | `str += ' World!'` equals `str = str + ' World!'` |
Real-World Examples
```
// Concatenation
let greeting = 'Hello, ' + userName;
// Concatenation Assignment
let logMessage = 'User logged in';
logMessage += ' at ' + currentTime;
```
Other Operators
Ternary Operator (`condition ? trueValue : falseValue`)
Nullish Coalescing Operator (`??`) - returns first operand if not null/undefined
Optional Chaining Operator (`?.`) - accesses properties without throwing errors
```
// Ternary Operator
let isAdmin = userRole === 'admin' ? true : false;
// Nullish Coalescing Operator
let defaultValue = userInput ?? 'default value';
// Optional Chaining Operator
let userName = user?.name;
```
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