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Kotlin
Infix Functions
A single-arg method/extension can be called without dot or parens when marked `infix`. Lets you write DSL-style code like `5 shouldBe 5` or `key to value`.
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Kotlin
Higher-Order Functions
Functions that take or return other functions. Foundation for streams, callbacks, DSLs — and an alternative to interfaces with a single method.
Go
Variadic Functions
`...T` in the last parameter slot accepts zero or more T values. Pass a slice by suffixing with `...` to spread it. Used everywhere from `fmt.Println` to custom builders.