Swift If…Else

🍎 Swift If…Else – Complete Tutorial

In Swift If…Else statements are used to make decisions based on conditions.
They control the flow of execution in iOS/macOS apps and are one of the most asked interview topics.

1️⃣ What is if…else in Swift?

An if…else statement:

• Evaluates a Boolean condition

• Executes code only if the condition is true

• Optionally executes alternative code if false

2️⃣ Simple if Statement ⭐

✔ Executes only when condition is true

3️⃣ if…else Statement ⭐

4️⃣ if…else if…else Ladder ⭐

Used when multiple conditions are checked.

5️⃣ Conditions Must Be Boolean ⭐ (Very Important)

❌ Invalid (C/Java style):

✅ Valid:

📌 Swift does not auto-convert numbers to Booleans.

6️⃣ Using Logical Operators (&&, ||, !) ⭐

7️⃣ if with Optional Binding ⭐⭐

Safely unwrap optional values.

📌 Very common in real iOS apps

8️⃣ if as an Expression (Swift Feature ⭐⭐)

Swift allows if to return a value.

✔ Cleaner code
✔ Interview bonus

9️⃣ Nested if Statements ❌ (Avoid When Possible)

Better:

🔟 if vs switch ⭐ (Interview)

1️⃣1️⃣ Common Mistakes ❌

❌ Using non-Boolean condition
❌ Forgetting braces {}
❌ Deep nesting
❌ Ignoring optional safety

📌 Interview Questions & MCQs

Q1. Condition inside if must return?

A) Int
B) String
C) Boolean
D) Any

✅ Answer: C

Q2. Which operator means AND?

A) &
B) &&
C) ||
D) !

✅ Answer: B

Q3. How to safely unwrap optional?

A) unwrap()
B) if let
C) try
D) guard

✅ Answer: B

Q4. Can if return a value in Swift?

A) No
B) Yes

✅ Answer: B

Q5. Better alternative to long if-else chains?

A) Loop
B) Array
C) switch
D) Function

✅ Answer: C

🔥 Real-Life Use Cases

✔ Form validation
✔ Login logic
✔ API response handling
✔ Access control
✔ UI state decisions

✅ Summary

• if…else controls decision making

• Conditions must be Boolean

• Supports logical operators

• Works with optionals (if let)

• Can be used as an expression

• Essential for Swift & iOS interviews