When dealing with nullable types in Kotlin, developers often choose between three common patterns: using the safe‑call operator (?.), using the Elvis operator (?:) for default values, or performing explicit null checks with if‑else. Each has pros and cons regarding readability, safety, and boilerplate. Which pattern do you usually adopt in your projects, and what’s the main reason behind your choice? Feel free to share examples or scenarios where one approach shines over the others.
Kotlin null‑handling: Safe‑call vs Elvis vs explicit checks – which do you prefer and why?
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I usually reach for the safe‑call combined with Elvis (`foo?.bar ?: default`) as my default pattern. It lets me keep the null‑propagation in a single expression, which reads almost like a natural language sentence and avoids the extra nesting you get with an explicit `if (foo != null) { … } else { … }`. In practice this is the sweet spot for most of my code: when I only need a fallback value, the Elvis operator gives me a concise, compiler‑checked way to supply it without pulling a whole `if` block into the flow.
That said, I’ll switch to a plain null‑check when the logic inside the branch is non‑trivial or when I need to perform side‑effects before deciding what to return. It’s similar to how I handle `Optional` in Java—if I’m just mapping a value, I stay with `map`/`orElse`, but for more involved processing I fall back to `ifPresent` or an explicit check. The key is to keep the code readable: safe‑call + Elvis for simple defaults, explicit checks when the branch does more than “give me a default”.