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Kotlin
map / filter / reduce
The three classic functional combinators. Each takes a lambda and returns a new collection (or a single value for reduce). Chain freely — intermediate allocations only matter at very large scale (use `Sequence` then).
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Rust
Iterator Chain — map / filter / collect
Rust iterators are lazy and zero-cost. Chain transformations and finally collect into a concrete container. The compiler unrolls the whole pipeline into a tight loop.
Kotlin
Property Delegation by Map
Delegate a property to a `Map<String, V>` — reading the property fetches by name; writing stores by name. Quick way to back a class with a config map.
Go
Generic Map / Filter / Reduce
Three classic functional combinators, generically typed. Go's standard library doesn't ship these (yet), but they're short enough to drop into any project.