Macros

->#

(macro -> (arg fn1 ...fns) (...)) Chain calls on a given value, for a nicer syntax

Author: @SuperFola

Parameters#

• arg: value to transform
• ...fns: series of functions to apply one by one to arg

Example#

(import std.Macros)
(-> "f0" f1)  # equivalent to (f1 "f0")
(-> "f0" f1 f2 f3) # equivalent to (f3 (f2 (f1 "f0")))
(-> "f0" f1 (apply _ f2) (apply _ f3))  # equivalent to (apply (apply (f1 "f0") f2) f3)

partial#

(macro partial (func ...defargs) (...)) Create a partial function with prefilled arguments

Author: @SuperFola

Parameters#

• func: function to make partial
• ...defargs: predefined arguments

Example#

(import std.Macros)
(let test_func (fun (a b c) (* a b c)))
(let test_func1 (partial test_func 1))
(let test_func2 (partial test_func1 2))
(print (test_func1 2 3))  # 6
(print (test_func2 3))  # 6

partial2#

(macro partial2 (call ...args) (...)) Create a partial function with prefilled arguments, allowing some arguments to be skipped

Author: @SuperFola

Parameters#

• call: function to make partial
• ...args: predefined arguments

Example#

(import std.Macros)
(let test_func (fun (a b c) (* a b c)))
(let test_func3 (partial2 test_func 1 _ 3))
(print (test_func3 2))  # 6

unless#

(macro unless (cond ...body) (...)) Create a reversed condition

Author: @SuperFola

Parameters#

• cond: condition
• body: then node (or then/else nodes)

Example#

(import std.Macros)
(unless (canCall? dog)
  (print "dog can't call")
  (print "dog can actually call us!"))
(unless false
  (print "this will always be executed"))

until#

(macro until (cond body) (...)) Iterate until the condition is truthy

Author: @SuperFola

Parameters#

• cond: condition
• body: loop body

Example#

(import std.Macros)
(mut data [0])
(until (= 10 (len data))
  (append! data (+ 1 (@ data -1))))
(print data)  # [0 1 2 3 4 5 6 7 8 9]