Scheme/Procedures

From Noisebridge
< Scheme(Difference between revisions)
Jump to: navigation, search
(Lambdas)
Line 5: Line 5:
 
where <expressions> is one or more, well, expressions. Only the last expression's value is returned.<br />
 
where <expressions> is one or more, well, expressions. Only the last expression's value is returned.<br />
 
<args> is your variable definitions, which can take the following forms:
 
<args> is your variable definitions, which can take the following forms:
* '''var''' - all arguments are put into this single variable.
+
* '''var''' - all arguments are put into this single variable (as a list.)
 
* '''(var[1] var[2] ... )''' - specifies a fixed number of arguments.
 
* '''(var[1] var[2] ... )''' - specifies a fixed number of arguments.
 
* '''(var[1] var[2] ... . var[n])''' - a space-delimited period before the final argument specifies the remaining args (if any) to be put into a list under that variable.
 
* '''(var[1] var[2] ... . var[n])''' - a space-delimited period before the final argument specifies the remaining args (if any) to be put into a list under that variable.
 
<br />
 
<br />
 +
 
== Lexical Scoping ==
 
== Lexical Scoping ==
 
=== fluid-let ===
 
=== fluid-let ===

Revision as of 13:06, 3 April 2011

Contents

Lambdas

  • Can also be viewed as anonymous procedures.
  • Has the following syntax:
(lambda <args> <expressions>)

where <expressions> is one or more, well, expressions. Only the last expression's value is returned.
<args> is your variable definitions, which can take the following forms:

  • var - all arguments are put into this single variable (as a list.)
  • (var[1] var[2] ... ) - specifies a fixed number of arguments.
  • (var[1] var[2] ... . var[n]) - a space-delimited period before the final argument specifies the remaining args (if any) to be put into a list under that variable.


Lexical Scoping

fluid-let

Modifies existing global variables instead of introducing new lexical ones. Values are reset at the end of the expression.

Iteration

do

(do
  ((<var> <init> <step>) ... )
   (<test> <expression>)
   (<command> ... ))
Personal tools