Chained function calls only work if the types in question have immutable functions that support chaining. This is the case for arrays with `map`, `filter` and f

Chained function calls only work if the types in question have immutable functions that support chaining. This is the case for arrays with `map`, `filter` and for promises with then/catch. But it's not the case for the majority of libraries, including many of the builtin types. A pipeline operator is generic and can be used everywhere, without requiring the API to be built around chaining. This can often lead to much nicer, more readable code. I think this is something you only start to really appreciate once you've used it a bit, like in Elixir or F#. Obviously this is much more natural in a functional language, where everything is immutable anyway.