What will be the output of this Kotlin code?

medium📝 Predict Output Q5 of 15

Kotlin - Collections Fundamentals

val arr = IntArray(3) { it * 2 }
println(arr.joinToString(","))

A1,2,3

B0,2,4

C2,4,6

D0,1,2

Step-by-Step Solution

Solution:

Step 1: Understand the initializer lambda for IntArray
Each element is initialized as its index multiplied by 2: 0*2=0, 1*2=2, 2*2=4.
Step 2: Check the printed output format
joinToString(",") joins elements with commas, so output is "0,2,4".
Final Answer:
0,2,4 -> Option B
Quick Check:
Initializer with index * 2 = 0,2,4 [OK]

Quick Trick: Initializer lambda uses index 'it' for values [OK]

Common Mistakes:

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