Chains

Chains allow multiple expressions to be appended together.

Basic use

Wolf provides the thin arrow -> operator, to allow previous expressions to be piped into later expressions.

The thin arrow stores the result of the previous expression in @.

-- `@` is replaced with 4, so this whole chain evaluates to 14.
2 + 2 -> @ + 10

If @ is being passed as .0 to a function, the fat arrow => can be used to omit it.

-- Manual:
(2, 5) -> max(@) -> log2(@) -> ceil(@) -> exp2(@)

-- Automatic:
(2, 5) => max() => log2() => ceil() => exp2()

You may mix thin arrows and fat arrows in the same chain.

(2, 5) => max -> 10 / @

Tuples with multiple expressions will implicitly chain those expressions with the thin arrow operator.

This form still permits use of @ to reference the prior expression.

-- These two expressions are identical
( 2 + 2 -> @ + 10 )

(
    2 + 2
    @ + 10
)