Swift if Statement

🍎 Swift `if` Statement – Simple & Clear Guide

In Swift, the if statement is used to execute code only when a condition is true.
It’s the foundation of decision-making in Swift and iOS development.

1️⃣ What is `if` in Swift?

The if statement:

Checks a Boolean condition
Runs code only if the condition evaluates to true

Syntax

2️⃣ Basic `if` Example ⭐

✔ Output:

3️⃣ Condition Must Be Boolean ⭐ (Very Important)

Swift does NOT allow non-Boolean conditions.

❌ Invalid:

✅ Valid:

4️⃣ Using Comparison Operators with `if`

Common operators:

== equal
!= not equal
> greater than
< less than
>=, <=

5️⃣ Using Logical Operators with `if` ⭐

Logical operators:

&& → AND
|| → OR
! → NOT

6️⃣ `if` with Optional Binding ⭐⭐

Safely unwrap optional values.

✔ Prevents crashes
✔ Very common in iOS apps

7️⃣ Multiple Conditions in One `if`

8️⃣ `if` as an Expression (Modern Swift ⭐⭐)

Swift allows if to return a value.

✔ Cleaner
✔ Interview bonus

9️⃣ Common Mistakes ❌

❌ Using non-Boolean condition
❌ Forgetting {}
❌ Deep nesting instead of logical operators
❌ Ignoring optional safety

📌 Interview Questions & Quick Answers

Q1. What type must an if condition return?
👉 Bool

Q2. Does Swift allow if (x) like C?
👉 ❌ No

Q3. How to safely unwrap optionals in if?
👉 if let

Q4. Can if return a value in Swift?
👉 ✅ Yes

✅ Summary

if executes code when condition is true
Condition must be Boolean
Supports comparison & logical operators
Works with optionals using if let
Can be used as an expression
Core topic for Swift & iOS interviews

Swift if Statement