Kotlin - Collections Fundamentals
Which of the following Kotlin statements correctly creates a mutable list of strings containing "red", "green", and "blue"?
Which of the following Kotlin statements correctly creates a mutable list of strings containing "red", "green", and "blue"?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify mutable list creation
mutableListOf() creates a mutable list. val colors = mutableListOf("red", "green", "blue") uses this correctly with string literals.Step 2: Check other options
val colors = listOf("red", "green", "blue") creates an immutable list. val colors = mutableListOf("red", "green", "blue") is syntactically valid but unnecessary to specify type explicitly here. val colors = arrayListOf("red", "green", "blue") creates an ArrayList, which is mutable but not the asked function. Final Answer:
val colors = mutableListOf("red", "green", "blue") -> Option DQuick Check:
mutableListOf() with values creates mutable list [OK]
Quick Trick: Use mutableListOf() to create mutable lists with initial values [OK]
Common Mistakes:
MISTAKES- Using listOf() which creates immutable list
- Unnecessarily specifying generic type
- Confusing arrayListOf() with mutableListOf()
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