Holes

A hole (_) can occurr in applications or invocations. Doing so results in a partially evaluated, delayed program.

For applications, it has the following syntax (here we have a delayed program with two parameters):

Some-expression(A, _, B, _, C)

For invocations, it has the following syntax (here we have a delayed program with one parameter):

_ between: 1 and: 5

These delayed programs can be applied later as normal:

let Program = _ between: 1 and: 5;
Program(3);
// Equivalent to `3 between: 1 and: 5`