(guile.info.gz) Syntax Summary

Info Catalog

(guile.info.gz) The REPL

(guile.info.gz) About Expressions

 
 14.3.3 Summary of Common Syntax
 -------------------------------
 
 This subsection lists the most commonly used Scheme syntactic
 expressions, simply so that you will recognize common special syntax
 when you see it.  For a full description of each of these syntaxes,
 follow the appropriate reference.
 
    `lambda' ( Lambda) is used to construct procedure objects.
 
    `define' ( Top Level) is used to create a new variable and
 set its initial value.
 
    `set!' ( Top Level) is used to modify an existing variable's
 value.
 
    `let', `let*' and `letrec' ( Local Bindings) create an inner
 lexical environment for the evaluation of a sequence of expressions, in
 which a specified set of local variables is bound to the values of a
 corresponding set of expressions.  For an introduction to environments,
 see  About Closure.
 
    `begin' ( begin) executes a sequence of expressions in order
 and returns the value of the last expression.  Note that this is not the
 same as a procedure which returns its last argument, because the
 evaluation of a procedure invocation expression does not guarantee to
 evaluate the arguments in order.
 
    `if' and `cond' ( if cond case) provide conditional
 evaluation of argument expressions depending on whether one or more
 conditions evaluate to "true" or "false".
 
    `case' ( if cond case) provides conditional evaluation of
 argument expressions depending on whether a variable has one of a
 specified group of values.
 
    `and' ( and or) executes a sequence of expressions in order
 until either there are no expressions left, or one of them evaluates to
 "false".
 
    `or' ( and or) executes a sequence of expressions in order
 until either there are no expressions left, or one of them evaluates to
 "true".
 

Info Catalog

(guile.info.gz) The REPL

(guile.info.gz) About Expressions