Swift Logical Operators

In Swift, logical operators are used to combine or invert Boolean values. They play a critical role in decision-making and controlling the flow of programs. Logical operators work with true and false values to form more complex conditions.

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Table – Logical Operators in Swift

Here is a list of logical operators available in Swift:

Operator	Description	Example
&&	Logical AND	Returns true if both operands are true
||	Logical OR	Returns true if at least one operand is true
!	Logical NOT	Inverts the Boolean value

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Example: Using Logical Operators

This example demonstrates how each logical operator works:

File: main.swift

let isSunny = true
let isWarm = false

// Logical AND
print("Is it sunny and warm? \(isSunny && isWarm)") // false

// Logical OR
print("Is it sunny or warm? \(isSunny || isWarm)") // true

// Logical NOT
print("Is it not sunny? \(!isSunny)") // false

Explanation:

• The && operator checks if both isSunny and isWarm are true. Since isWarm is false, the result is false.
• The || operator checks if either isSunny or isWarm is true. Since isSunny is true, the result is true.
• The ! operator inverts the value of isSunny. Since isSunny is true, the result is false.

Output:

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Example 1: Combining Conditions

This example shows how logical operators can combine multiple conditions:

File: main.swift

let age = 20
let hasID = true

if age >= 18 && hasID {
    print("You are allowed to enter.")
} else {
    print("You are not allowed to enter.")
}

Explanation:

• The condition age >= 18 && hasID checks if the person is at least 18 years old and has an ID.
• Since both conditions are true, the program prints “You are allowed to enter.”

Output:

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Example 2: Using Logical OR

This example demonstrates the use of the || operator:

File: main.swift

let hasKey = false
let knowsPassword = true

if hasKey || knowsPassword {
    print("You can unlock the door.")
} else {
    print("Access denied.")
}

Explanation:

• The condition hasKey || knowsPassword checks if the person either has the key or knows the password.
• Since knowsPassword is true, the program prints “You can unlock the door.”

Output:

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Example 3: Using Logical NOT

This example demonstrates the ! operator:

File: main.swift

let isOnline = false

if !isOnline {
    print("The user is offline.")
} else {
    print("The user is online.")
}

Explanation:

• The ! operator inverts the value of isOnline.
• Since isOnline is false, !isOnline evaluates to true, and the program prints “The user is offline.”

Output:

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Conclusion

Logical operators are essential tools for combining and manipulating Boolean values in Swift. They are widely used in conditional statements and loops to implement complex logic.