Kotlin - Collections Fundamentals
You want to create an array of size 4 where each element is its index squared (0, 1, 4, 9). Which Kotlin code correctly does this?
You want to create an array of size 4 where each element is its index squared (0, 1, 4, 9). Which Kotlin code correctly does this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand array initialization with lambda
Kotlin'sArray(size) { index -> value }creates an array where each element is initialized by the lambda using the index.Step 2: Check each option
val arr = Array(4) { index -> index * index }uses explicit lambda parameterindexand correctly computes index squared.val arr = arrayOf(4) { index -> index * index }is invalid becausearrayOfdoes not take a size and lambda.val arr = intArrayOf(4) { index -> index * index }is invalid syntax for theintArrayOffactory function.val arr = Array(4) { -> it * it }has invalid lambda syntax whereitis undefined.Final Answer:
val arr = Array(4) { index -> index * index } -> Option AQuick Check:
Use Array(size) with index lambda for computed values [OK]
Quick Trick: Use Array(size) with index lambda for computed elements [OK]
Common Mistakes:
MISTAKES- Confusing it with index in lambda
- Using arrayOf() for dynamic initialization
- Not using lambda for element computation
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