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| author | Michele Simionato <michele.simionato@gmail.com> | 2010-10-10 06:47:17 +0200 |
|---|---|---|
| committer | Michele Simionato <michele.simionato@gmail.com> | 2010-10-10 06:47:17 +0200 |
| commit | 61a986d2b3f12b0cd4f3204e787f613990298b9b (patch) | |
| tree | 7a1b8acc4df81b30f08a446b6cc9d84cce15a561 | |
| parent | 103491bf3c502794cacb037489557a7b7010bd10 (diff) | |
| download | micheles-61a986d2b3f12b0cd4f3204e787f613990298b9b.tar.gz | |
Fixed a few misprints in the adventure #20
| -rw-r--r-- | artima/scheme/scheme20.ss | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/artima/scheme/scheme20.ss b/artima/scheme/scheme20.ss index 2681370..346cf6d 100644 --- a/artima/scheme/scheme20.ss +++ b/artima/scheme/scheme20.ss @@ -23,7 +23,7 @@ programs with compiler semantics which are not portable. Fortunately the module system works well enough for most simple cases. The proof is that we introduced the R6RS module system in -episode 5_, and for 15 episode we could go on safely by just using the +episode 5_, and for 15 episodes we could go on safely by just using the basic import/export syntax. However, once nontrivial macros enters in the game, things are not easy anymore. @@ -65,9 +65,9 @@ as batch compiler for scripts. Conceptually, in Python everything happens at runtime, including bytecode compilation. While technically bytecode compilation -is cached, conceptually you may very well think that every module -is recompiled at runtime, when you import it - which is actually what -happens if the module has changed in the meanwhile. +is cached, i.e. Python does not recompile already imported modules, +conceptually you may think that every module +is recompiled at runtime, when you import it. In short, you can consider Python as an interpreter (as it is usually done) and there is no substantial difference between typing commands @@ -141,7 +141,7 @@ on the helper function ``distinct?`` defined as follows: $$list-utils:DISTINCT? ``distinct?`` takes a list of objects and finds out they are all -distinct according to some equality operator, of if there are duplicates. +distinct according to some equality operator, or if there are duplicates. Here are a couple of test cases: $$TEST-DISTINCT @@ -188,7 +188,7 @@ to bytecode in Ypsilon - and executed immediately. Each new definition augments the namespace of known names at runtime, both for first class objects and macros. Macros are both defined and expanded at runtime. -It is clear tha the semantics of an incremental compiler is +It is clear that the semantics of an incremental compiler is very similar to the semantics of an interpreter; here is an example in Ikarus, where a macro is defined which depends from a helper function: |