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Kotlin Conditions
Kotlin Conditions – Controlling the Flow
In real life, you make choices all the time:
- If it's raining → Take an umbrella.
- If you're hungry → Grab a snack.
Similarly, in Kotlin, conditions help your code make decisions and act accordingly.
The Classic if Statement
Use if to perform something only when a rule is true:
val age = 18
if (age >= 18) {
println("You're allowed to vote!")
}
If the age is 18 or more, the message appears. Otherwise — silence.
else – The “Otherwise” Option
Want a backup plan if the condition fails? Add else:
val score = 45
if (score >= 50) {
println("Passed")
} else {
println("Try again")
}
This gives two paths: one if it's true, one if not.
else if – Multiple Paths
What if there are several outcomes?
val marks = 85
if (marks >= 90) {
println("Grade: A+")
} else if (marks >= 80) {
println("Grade: A")
} else if (marks >= 70) {
println("Grade: B")
} else {
println("Keep improving")
}
Checks happen top-down — first match wins.
Short if – Inline Style
Use a one-liner for simple choices:
val isLoggedIn = true
If (isLoggedIn) println("Welcome back!")
Compact and clean.
if as an Expression – Return a Value
You can assign the result of an if block directly into a variable:
val temperature = 25 val weather = if (temperature > 30) "Hot" else "Pleasant" Println(weather) // Outputs: Pleasant
Neat trick for shorter, readable code.
Nested if – Inside Layers
Conditions inside conditions?
val user = "admin"
val password = "1234"
if (user == "admin") {
if (password == "1234") {
println("Access granted")
} else {
println("Wrong password")
}
} else {
println("Unknown user")
}
Only moves deeper if outer check passes.
Recap Table
| Type | Syntax Example | Use Case |
|---|---|---|
| Basic if | if (x > 5) | Single condition |
| else | else { ... } | Alternative path |
| else if | else if (x == 3) | Chain of decisions |
| Inline if | if (isTrue) println("Yes") | Short checks |
| Expression | val msg = if (ok) "Yes" else "No" | Store outcomes in variable |
| Nested | if (a) { if (b) { ... } } | Step-by-step validation |
Prefer Learning by Watching?
Watch these YouTube tutorials to understand KOTLIN Tutorial visually:
What You'll Learn:
- 📌 Kotlin If Else Statement Explained | Basics Of Kotlin For Beginners | Kotlin Tutorial | Simplilearn
- 📌 #11 Kotlin Tutorial | If Else Expression