Feature request: Functional operators

[ConorOBrien-Foxx]

There should be an operator that curries a function. Perhaps ~:?

let add = ~: (x, y, z) -> x + y * z;
print(add(3)(4)(5));    // 23

A memoizing function/operator. E.g.:

let fib = memo(n -> n < 2 ? n : fib(n - 1) + fib(n - 2))
fib(1000); // takes however long
fib(1000); // takes virtually no time

Dynamic programing FTW!

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I wonder if any more should be considered.