[Solved] Find the error in this Kotlin snippet:fun getLength(str: String?): Int { return str.length } — Ans: Cannot access length on nullable type without safe call or assertion. | Kotlin

Kotlin - Null Safety

Find the error in this Kotlin snippet:

fun getLength(str: String?): Int {
  return str.length
}

AFunction must return String, not Int.

BCannot access length on nullable type without safe call or assertion.

Cstr should be declared as non-nullable String.

DNo error; code compiles and runs fine.

Step-by-Step Solution

Solution:

Step 1: Check parameter type
str is nullable String, so direct access to length is unsafe.
Step 2: Identify missing safe call or assertion
Accessing str.length without ?. or !! causes compile error.
Final Answer:
Cannot access length on nullable type without safe call or assertion. -> Option B
Quick Check:
Nullable property access requires ?. or !! [OK]

Quick Trick: Use ?. or !! to access nullable properties safely [OK]

Common Mistakes:

MISTAKES

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