Bool type and logical operators in Swift - Cheat Sheet & Quick Revision

Recall & Review

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What is the Bool type in Swift?

Bool is a data type in Swift that can hold only two values: true or false. It is used to represent logical conditions.

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What does the logical AND operator (&&) do?

The logical AND operator (&&) returns true only if both conditions on its sides are true. Otherwise, it returns false.

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What is the result of true || false in Swift?

The logical OR operator (||) returns true if at least one of the conditions is true. So, true || false evaluates to true.

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How does the logical NOT operator (!) work?

The logical NOT operator (!) reverses the value of a Bool. If the value is true, it becomes false, and vice versa.

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What will be the output of this Swift code?<br><pre>let a = true
let b = false
print(a && b)</pre>

The output will be false because the AND operator (&&) requires both values to be true, but here b is false.

Which of these is a valid Bool value in Swift?

A "false"

B yes

C 1

D true

Only true and false are valid Bool values in Swift.

What does the expression false || false evaluate to?

A true

B false

C nil

D error

The OR operator (||) returns true if at least one side is true. Here both are false, so result is false.

What is the result of !true in Swift?

A nil

B true

C false

D error

The NOT operator (!) reverses the Bool value, so !true is false.

Which operator checks if both conditions are true?

A &&

B !

C ||

D ==

The AND operator (&&) returns true only if both conditions are true.

What will print(true && false) output?

A false

B true

C nil

D error

AND operator requires both true, here one is false, so output is false.

Explain the Bool type and how logical operators work in Swift.

Think about true/false values and how you combine or reverse them.

Describe a real-life example where you might use logical AND and OR operators.

Think about everyday decisions with multiple conditions.