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Article contents:[[tags: manual]] [[toc:]] == Module (scheme eval) This module provides R7RS procedures to evaluate expressions dynamically. === environment <procedure>(environment LIST ...)</procedure> This procedure returns a specifier for the environment that results by starting with an empty environment and then importing each list, considered as an import set, into it. (See section 5.6 of R7RS for a description of import sets.) The bindings of the environment represented by the specifier are immutable, as is the environment itself. === eval <procedure>(eval EXPR-OR-DEF [ENVIRONMENT-SPECIFIER])</procedure> If EXPR-OR-DEF is an expression, it is evaluated in the specified environment and its values are returned. If it is a definition, the specified identifier(s) are defined in the specified environment, provided the environment is not immutable. The {{ENVIRONMENT-SPECIFIER}} is optional, and if not provided it defaults to the value of {{(interaction-environment)}}. This is a CHICKEN extension to R7RS, which, though strictly nonportable, is very common among Scheme implementations. (eval '(* 7 3) (environment '(scheme base))) ==> 21 (let ((f (eval '(lambda (f x) (f x x)) (null-environment 5)))) (f + 10)) ==> 20 --- Previous: [[Module (scheme file)]] Next: [[Module (scheme inexact)]] Description of your changes:

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What do you get when you subtract 19 from 11?