> On 8 Mar 2018, at 17:58, Eliot Miranda <[email protected]> wrote: > > Hi Stef, > > following on from Sean, (+1000 for using ordinary quotes) > > ’string’ collection of characters => ’string’ sequence of characters > $a, Character space Two ways to create characters => $a, Character space two > ways to denote characters (or two ways to write characters; all other > explanations in this list are not capitalized; this shouldn't be either) > exp1. exp2 expression separator => expr1. expr2 statement separator > ; message cascade => expr doThis ; doThat semicolon - message cascade (c.f. > exp1. exp2 expression separator) > ^ expr caret - returns a result from a method => ^ expr caret - return a > result from a method (or, ParcPlace preference, answer a result from a > method, since we're sending messages here) > > ... > A unary message is one with no arguments. => A unary message has no > arguments. (c.f. A binary message takes only one argument ...) > ... > Set new add: 4; add: 4 ; yourself ~> aSet => Set new add: 4; add: 4 ; > yourself ~> aSet(4) > Dictionary new at: #a put: 'Alpha' ; yourself a Dictionary => Dictionary new > at: #a put: 'Alpha' ; yourself a Dictionary(#a->'Alpha' ) > > and then in the Files and Stream section I would give two more examples of > exactly the same sequence that use the convenience APIs. This is the > existing text: > > work := FileSystem disk workingDirectory. > stream := (work / ’foo.txt’) writeStream. > stream nextPutAll: ’Hello World’. > stream close. > stream := (work / ’foo.txt’) readStream. > stream contents. ~> 'Hello World' > stream close. > > I would make it read > > work := FileSystem disk workingDirectory. > stream := (work / ’foo.txt’) writeStream. > stream nextPutAll: ’Hello World’. > stream close. > stream := (work / ’foo.txt’) readStream. > stream contents. ~> 'Hello World' > stream close. > > or, more simply > > work := FileSystem disk workingDirectory. > (work / ’foo.txt’) writeStreamDo: [ :fileStream | fileStream > nextPutAll: ’Hello World’ ]. > (work / ’foo.txt’) readStreamDo: [ :fileStream | fileStream contents] > ~> 'Hello World' > > or, more simply still > > work := FileSystem disk workingDirectory. > (work / ’foo.txt’) writeStreamDo: [ :fileStream | fileStream > nextPutAll: ’Hello World’ ]. > (work / ’foo.txt’) contents > ~> 'Hello World'
file := FileSystem disk workingDirectory / 'foo' , 'txt'. file ensureDelete. file writeStreamDo: [ :fileStream | fileStream nextPutAll: 'Hello World' ]. file contents. file delete. (to make it re-entrant and a bit more concise) +1e10 for plain single quotes, VERY important. > or if you can't make it fit, just give the last version > > Finally, this seems to have fallen off the end: > A simple, uniform and powerful model > Pharo has a simple dynamically-typed object model: > > Perhaps shrink the picture of the browser. You can save three lines by > writing > OrderedCollection new > add: 1; > add: 2; > add: 3. > > as OrderedCollection new add: 1; add: 2; add: 3. > And another by writing 2=2 ifTrue: [ Error signal: ’Help’ ]. on one line. > > HTH > > On Fri, Apr 8, 2016 at 12:56 PM, stepharo <[email protected]> wrote: > new cheatsheet for Pharo syntax. > Any feedback is welcome > > Stef > > > > -- > _,,,^..^,,,_ > best, Eliot
