DOC HOME SITE MAP MAN PAGES GNU INFO SEARCH
 

(guile.info.gz) About Expressions

Info Catalog (guile.info.gz) About Procedures (guile.info.gz) Basic Ideas (guile.info.gz) About Closure
 
 14.3 Expressions and Evaluation
 ===============================
 
 So far, we have met expressions that _do_ things, such as the `define'
 expressions that create and initialize new variables, and we have also
 talked about expressions that have _values_, for example the value of
 the procedure invocation expression:
 
      (string-append "/home" "/" "andrew")
 
 but we haven't yet been precise about what causes an expression like
 this procedure invocation to be reduced to its "value", or how the
 processing of such expressions relates to the execution of a Scheme
 program as a whole.
 
    This section clarifies what we mean by an expression's value, by
 introducing the idea of "evaluation".  It discusses the side effects
 that evaluation can have, explains how each of the various types of
 Scheme expression is evaluated, and describes the behaviour and use of
 the Guile REPL as a mechanism for exploring evaluation.  The section
 concludes with a very brief summary of Scheme's common syntactic
 expressions.
 

Menu

 
* Evaluating                  How a Scheme program is executed.
* The REPL                    Interacting with the Guile interpreter.
* Syntax Summary              Common syntactic expressions -- in brief.
 
Info Catalog (guile.info.gz) About Procedures (guile.info.gz) Basic Ideas (guile.info.gz) About Closure
automatically generated byinfo2html