Racket Cheat Sheet
来源 http://docs.racket-lang.org/racket-cheat/index.html?q=Racket%20Cheat%20Sheet
Essentials
| Sites | |
| Community | |
| Put "Hello, world!" in hello.rkt and run racket hello.rkt |
Primitives
Numbers
| integer 1 rational 1/2 complex 1+2ifloating 3.14 double 6.02e+23 hex #x29 octal #o32 binary #b010101 | |
| Arithmetic | ... |
| Compare | |
| Bitwise | |
| Format | |
| Test | ... ... |
| Misc | |
| Match Pattern | (? n) 42 |
Strings
| "Racket" quoting "a \" approaches!"unicode "λx:(μα.α→α).xx" | |
| Create | |
| Observe | |
| Modify | |
| Test | |
| #rx"a|b" #rx"^c(a|d)+r$" | |
| Match Pattern | (? s) "Banana?" |
Bytes
| #"rawbytes\0" | |
| Create | |
| Numbers | |
| Observe | |
| Modify | |
| Conversion | |
| Test | |
| Match Pattern | (? b) #"0xDEADBEEF" |
Other
| Booleans | #t #f |
| #\a #\tab #\λ ... ... | |
| 'Racket | |
| Boxes | |
| Procedures | |
| Void | |
| Undefined |
Data
Lists
| Create | |
| Observe | |
| Use | |
| Modify | ... |
| Match Pattern | ( a b c) ( a b more)( top more ...) |
Immutable Hash
| Create | |
| Observe | |
| Modify |
Vector
| Create | |
| Observe | |
| Modify | |
| Match Pattern | ( x y z) ( x ycalabi–yau ...) |
Streams
| Create | |
| Observe |
Mutable Hash
| Create | |
| Observe | |
| Modify |
Systems
Input/Output
| Formatting | |
| Input | |
| Output | |
| Ports and Files | ... |
Files
| Paths | ... |
| Files |
Miscellaneous
| Time | |
| Command-Line Parsing | |
| FFI | ... |
Networking
| TCP | |
| HTTP | |
| URLs | |
| ... | |
| JSON | |
| XML | |
| Databases | ... |
Security
| Custodians | |
| Sandboxes |
Concurrency
| Threads | |
| Events | ... |
| Channels | |
| Semaphores | |
| Async Channels |
Parallelism
| Futures | ... |
| Places | ... |
| Processes |
Syntax (Beginner)
Basics
| Modules | ( main body ...) ( test body ...) ( mod-path) (id) |
| S-expressions | '(a b c) `(1 2 ,( 1 2)) |
| Procedure Applications | (fn arg1 arg2) (fn arg1 #:keyarg2) ( fn arg1 ( arg2)) |
| Procedures | ( (x) x) ( (x) x) ( (x [opt 1]) ( x opt)) ( (x #:req key) ( x key)) ( (x #:opt [key 1]) ( xkey)) |
| Binding | ( ([x 1] [y 2]) ( x y)) ( ([x 1] [x ( x 1)]) x) |
| Conditionals | ( ( x) 0 ( 1 x)) ( [( x) 0] [( x)1] [ "impossible!"]) |
| Definitions | ( x 1) ( (f y) ( x y)) |
| Iteration | |
| Blocks | |
| Require Sub-forms | ... |
| Provide Sub-forms | ... |
Structures
| Definition | ( dillo (weight color)) |
| Create | ( danny (dillo 17.5'purple)) |
| Observe | (dillo? danny) (dillo-weightdanny) (dillo-color danny) |
| Modify | ( dillo danny([weight 18.0])) |
| Match Pattern | (dillo w c) |
Pattern Matching
| Basics | ( value [pat body] ...) |
| Definitions | ( pat value) |
| Patterns | (quote datum) ( lvp ...)(list-no-order pat ...) (vectorlvp ...) (struct-id pat ...)(regexp rx-expr pat) (or pat...) (and pat ...) (? expr pat...) |
Syntax (Intermediate)
Basics
| Mutation | |
| Exceptions | |
| Promises | |
| Continuations | |
| Parameters | |
| External Files Needed at Runtime | |
| Continuation Marks | |
| Multiple Values |
Contracts
| Basics | ... |
| Functions | |
| Application |
Iteration
| Sequences | |
| Generators |
Structures
| Sub-structures | ( 2d (x y)) ( 3d2d (z)) (2d-x (3d 1 2 3)) |
| Mutation | ( monster (type [hp#:mutable])) ( healie(monster 'slime 10)) (set-monster-hp! healie 0) |
| Transparency | ( cash ($ ¢)#:transparent) ( (cash 5 95)) |
| Printing | ( nickname [n v]#:methods [( (write-proc nn pmode) ( p (nickname-nnn)))]) ( (nickname"evens" ( 0 100 2))) |
| Serialization | ( txn (who what where)#:prefab) ( (txn"Mustard" "Spatula""Observatory")) |
Generics
| Definition | |
| Instantiation | ( even-set () #:methods [( (st i) ( i))]) |
Classes
| Definition | |
| Instantiation | |
| Methods | |
| Fields | |
| Mixins | |
| Traits | ... |
| Contracts |
Syntactic Abstractions
| Definition | |
| Templates | |
| Parsing ()-Syntax | |
| Syntax Objects | ... |
| Transformers | ... |
| Syntax Parameters | |
| Parsing Raw Syntax |
Tools
| Inspection | raco pkg show |
| Finding | |
| Installing | raco pkg install |
| Updating | raco pkg update |
| Removing | raco pkg remove |
Miscellaneous
| raco make program.rkt | |
| raco test program.rkt a-directory | |
| raco exe program.rkt | |
| Extending DrRacket | |
| Slides |
================= End