For example, the Swedish word Lagom. Or, in programming, Common Lisp macros, monads in Haskell, the act of defining a word in Forth, etc. (It's easier for me to list idioms in a language other than English, because I'm immersed in English most of the time.)

While trying to implement algorithm X in a language without garbage collection (for example) is possible, the expression may become so burdened by otherwise superfluous detail that the original meaning is obscured like a "needle in a haystack".