diff options
| -rw-r--r-- | brainfuck.html.markdown | 32 | ||||
| -rw-r--r-- | go.html.markdown | 10 | ||||
| -rw-r--r-- | lua.html.markdown | 15 | ||||
| -rw-r--r-- | objective-c.html.markdown | 10 |
4 files changed, 36 insertions, 31 deletions
diff --git a/brainfuck.html.markdown b/brainfuck.html.markdown index 2b7ce4db..9282381f 100644 --- a/brainfuck.html.markdown +++ b/brainfuck.html.markdown @@ -1,11 +1,12 @@ --- language: brainfuck contributors: - - ["Prajit Ramachandran", "http://prajitr.github.io"] + - ["Prajit Ramachandran", "http://prajitr.github.io/"] + - ["Mathias Bynens", "http://mathiasbynens.be/"] --- -Brainfuck is an extremely minimal programming language (just 8 commands) and -is Turing complete. +Brainfuck (not capitalized except at the start of a sentence) is an extremely +minimal Turing-complete programming language with just 8 commands. ``` Any character not "><+-.,[]" (excluding quotation marks) is ignored. @@ -27,7 +28,7 @@ There are eight commands: [ and ] form a while loop. Obviously, they must be balanced. -Let's look at some basic Brainfuck programs. +Let's look at some basic brainfuck programs. ++++++ [ > ++++++++++ < - ] > +++++ . @@ -45,21 +46,18 @@ print cell #2's value. 65 is 'A' in ASCII, so 'A' is printed to the terminal. , [ > + < - ] > . -This program reads a character from the user input, copies the character into -another cell, and prints out the same character. - -, reads in a character from the user into cell #1. Then we start a loop. Move -to cell #2, increment the value at cell #2, move back to cell #1, and decrement -the value at cell #1. This continues on until cell #1 is 0, and cell #2 holds -cell #1's old value. Because we're on cell #1 at the end of the loop, move to -cell #2, and then print out the value in ASCII. +This program reads a character from the user input and copies the character into +cell #1. Then we start a loop. Move to cell #2, increment the value at cell #2, +move back to cell #1, and decrement the value at cell #1. This continues on +until cell #1 is 0, and cell #2 holds cell #1's old value. Because we're on +cell #1 at the end of the loop, move to cell #2, and then print out the value +in ASCII. Also keep in mind that the spaces are purely for readibility purposes. You -could just as easily write it as +could just as easily write it as: ,[>+<-]>. - Try and figure out what this program does: ,>,< [ > [ >+ >+ << -] >> [- << + >>] <<< -] >> @@ -73,7 +71,7 @@ problem: at the end of the inner loop, cell #2 is zero. To solve this problem, we also increment cell #4, and then recopy cell #4 into cell #2. ``` -And that's Brainfuck. Not that hard, eh? For fun, you can write your own -Brainfuck programs, or you can write a Brainfuck interpreter in another +And that's brainfuck. Not that hard, eh? For fun, you can write your own +brainfuck programs, or you can write a brainfuck interpreter in another language. The interpreter is fairly simple to implement, but if you're a -masochist, trying writing a Brainfuck interpreter... in Brainfuck. +masochist, try writing a brainfuck interpreter… in brainfuck. diff --git a/go.html.markdown b/go.html.markdown index 4db76a49..3a3800dd 100644 --- a/go.html.markdown +++ b/go.html.markdown @@ -1,4 +1,4 @@ ---- +--- name: Go category: language language: Go @@ -46,7 +46,7 @@ func main() { } // Functions have parameters in parentheses. -// If there are no parameters, empty parens are still required. +// If there are no parameters, empty parentheses are still required. func beyondHello() { var x int // Variable declaration. Variables must be declared before use. x = 3 // Variable assignment. @@ -71,7 +71,7 @@ func learnTypes() { can include line breaks.` // same string type // non-ASCII literal. Go source is UTF-8. - g := 'Σ' // rune type, an alias for uint32, holds a UTF-8 code point + g := 'Σ' // rune type, an alias for uint32, holds a unicode code point f := 3.14195 // float64, an IEEE-754 64-bit floating point number c := 3 + 4i // complex128, represented internally with two float64s @@ -251,7 +251,7 @@ func learnConcurrency() { fmt.Println(<-c, <-c, <-c) // channel on right, <- is "receive" operator. cs := make(chan string) // another channel, this one handles strings. - cc := make(chan chan string) // a channel of channels. + cc := make(chan chan string) // a channel of string channels. go func() { c <- 84 }() // start a new goroutine just to send a value go func() { cs <- "wordy" }() // again, for cs this time // Select has syntax like a switch statement but each case involves @@ -259,7 +259,7 @@ func learnConcurrency() { // that are ready to communicate. select { case i := <-c: // the value received can be assigned to a variable - fmt.Println("it's a", i) + fmt.Printf("it's a %T", i) case <-cs: // or the value received can be discarded fmt.Println("it's a string") case <-cc: // empty channel, not ready for communication. diff --git a/lua.html.markdown b/lua.html.markdown index 7325a1cf..369de908 100644 --- a/lua.html.markdown +++ b/lua.html.markdown @@ -125,6 +125,9 @@ f = function (x) return x * x end -- And so are these: local function g(x) return math.sin(x) end +local g = function(x) return math.xin(x) end +-- Equivalent to local function g(x)..., except referring +-- to g in the function body won't work as expected. local g; g = function (x) return math.sin(x) end -- the 'local g' decl makes g-self-references ok. @@ -133,6 +136,10 @@ local g; g = function (x) return math.sin(x) end -- Calls with one string param don't need parens: print 'hello' -- Works fine. +-- Calls with one table param don't need parens +-- either (more on tables below): +print {} -- Works fine too. + ---------------------------------------------------- -- 3. Tables. @@ -203,7 +210,7 @@ f2 = {a = 2, b = 3} metafraction = {} function metafraction.__add(f1, f2) - sum = {} + local sum = {} sum.b = f1.b * f2.b sum.a = f1.a * f2.b + f2.a * f1.b return sum @@ -266,7 +273,7 @@ eatenBy = myFavs.animal -- works! thanks, metatable Dog = {} -- 1. function Dog:new() -- 2. - newObj = {sound = 'woof'} -- 3. + local newObj = {sound = 'woof'} -- 3. self.__index = self -- 4. return setmetatable(newObj, self) -- 5. end @@ -301,7 +308,7 @@ mrDog:makeSound() -- 'I say woof' -- 8. LoudDog = Dog:new() -- 1. function LoudDog:makeSound() - s = self.sound .. ' ' -- 2. + local s = self.sound .. ' ' -- 2. print(s .. s .. s) end @@ -322,7 +329,7 @@ seymour:makeSound() -- 'woof woof woof' -- 4. -- If needed, a subclass's new() is like the base's: function LoudDog:new() - newObj = {} + local newObj = {} -- set up newObj self.__index = self return setmetatable(newObj, self) diff --git a/objective-c.html.markdown b/objective-c.html.markdown index 9e9f43e7..926a4a0d 100644 --- a/objective-c.html.markdown +++ b/objective-c.html.markdown @@ -160,7 +160,7 @@ int main (int argc, const char * argv[]) int jj; for (jj=0; jj < 4; jj++) { - NSLog(@"%d,", jj++); + NSLog(@"%d,", jj); } // => prints "0," // "1," // "2," @@ -223,7 +223,7 @@ int main (int argc, const char * argv[]) // } // -/+ (type) Method declarations; // @end -@interface MyClass : NSObject <MyCustomProtocol> +@interface MyClass : NSObject <MyProtocol> { int count; id data; @@ -241,14 +241,14 @@ int main (int argc, const char * argv[]) + (NSString *)classMethod; // - for instance method -- (NSString *)instanceMethodWithParmeter:(NSString *)string; +- (NSString *)instanceMethodWithParameter:(NSString *)string; - (NSNumber *)methodAParameterAsString:(NSString*)string andAParameterAsNumber:(NSNumber *)number; @end // Implement the methods in an implementation (MyClass.m) file: -@implementation UserObject +@implementation MyClass // Call when the object is releasing - (void)dealloc @@ -271,7 +271,7 @@ int main (int argc, const char * argv[]) return [[self alloc] init]; } -- (NSString *)instanceMethodWithParmeter:(NSString *)string +- (NSString *)instanceMethodWithParameter:(NSString *)string { return @"New string"; } |