Functions

keyword?

(keyword? v) -> boolean?

v: any/c

mutable-vector

(mutable-vector args ...) -> mutable-vector?

struct

Macro for creating a new struct, in the form of: (struct <struct-name> (fields ...) options ...) The options can consist of the following:

Single variable options (those which their presence indicates #true)

• #:mutable
• #:transparent

Other options must be presented as key value pairs, and will get stored in the struct instance. They will also be bound to the variable ___<struct-name>-options___ in the same lexical environment where the struct was defined. For example:

λ > (struct Applesauce (a b c) #:mutable #:transparent #:unrecognized-option 1234)
λ > ___Applesauce-options___
=> #<hashmap {
    '#:fields: '(a b c),
    '#:mutable: #false,
    '#:transparent: #false,
    '#:unrecognized-option: 1234,
}> 

By default, structs are immutable, which means setter functions will not be generated. Also by default, structs are not transparent, which means printing them will result in an opaque struct that does not list the fields