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arjans
/ gist:3259688
Created
August 4, 2012 20:16
— forked from janewang/gist:3259652
Y Combinator vs. U Combinator vs. Typical Recursion
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| // Y combinator | |
| function Y(f) { | |
| return ( | |
| (function (x) { | |
| return f(function (v) { return x(x)(v); }); }) | |
| (function (x) { | |
| return f(function (v) { return x(x)(v); }); }) | |
| ); | |
| } |
danking
/ gist:1068185
Created
July 6, 2011 19:55
A very simple example showing how to use Racket's lexing and parsing utilities
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| #lang racket | |
| (require parser-tools/lex | |
| (prefix-in re- parser-tools/lex-sre) | |
| parser-tools/yacc) | |
| (provide (all-defined-out)) | |
| (define-tokens a (NUM VAR)) | |
| (define-empty-tokens b (+ - EOF LET IN)) | |
| (define-lex-trans number | |
| (syntax-rules () |
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