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[factor/en] minor typo. dont -> don't

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Jacob Ward 2016-03-05 17:57:08 -07:00
parent a7da2cedb6
commit e2221d36cc
1 changed files with 20 additions and 20 deletions
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@ -24,33 +24,33 @@ Code in this file can be typed into Factor, but not directly imported because th
5 4 + ! No output 5 4 + ! No output
! `.` pops the top result from the stack and prints it. ! `.` pops the top result from the stack and prints it.
. ! 9 . ! 9
! More examples of arithmetic: ! More examples of arithmetic:
6 7 * . ! 42 6 7 * . ! 42
1360 23 - . ! 1337 1360 23 - . ! 1337
12 12 / . ! 1 12 12 / . ! 1
13 2 mod . ! 1 13 2 mod . ! 1
99 neg . ! -99 99 neg . ! -99
-99 abs . ! 99 -99 abs . ! 99
52 23 max . ! 52 52 23 max . ! 52
52 23 min . ! 23 52 23 min . ! 23
! A number of words are provided to manipulate the stack, collectively known as shuffle words. ! A number of words are provided to manipulate the stack, collectively known as shuffle words.
3 dup - ! duplicate the top item (1st now equals 2nd): 3 - 3 3 dup - ! duplicate the top item (1st now equals 2nd): 3 - 3
2 5 swap / ! swap the top with the second element: 5 / 2 2 5 swap / ! swap the top with the second element: 5 / 2
4 0 drop 2 / ! remove the top item (dont print to screen): 4 / 2 4 0 drop 2 / ! remove the top item (don't print to screen): 4 / 2
1 2 3 nip .s ! remove the second item (similar to drop): 1 3 1 2 3 nip .s ! remove the second item (similar to drop): 1 3
1 2 clear .s ! wipe out the entire stack 1 2 clear .s ! wipe out the entire stack
1 2 3 4 over .s ! duplicate the second item to the top: 1 2 3 4 3 1 2 3 4 over .s ! duplicate the second item to the top: 1 2 3 4 3
1 2 3 4 2 pick .s ! duplicate the third item to the top: 1 2 3 4 2 3 1 2 3 4 2 pick .s ! duplicate the third item to the top: 1 2 3 4 2 3
! Creating Words ! Creating Words
! The `:` word sets Factor into compile mode until it sees the `;` word. ! The `:` word sets Factor into compile mode until it sees the `;` word.
: square ( n -- n ) dup * ; ! No output : square ( n -- n ) dup * ; ! No output
5 square . ! 25 5 square . ! 25
! We can view what a word does too. ! We can view what a word does too.
! \ suppresses evaluation of a word and pushes its identifier on the stack instead. ! \ suppresses evaluation of a word and pushes its identifier on the stack instead.
@ -88,9 +88,9 @@ Code in this file can be typed into Factor, but not directly imported because th
0 [ "Zero is true" . ] when ! Zero is true 0 [ "Zero is true" . ] when ! Zero is true
f [ "F is true" . ] when ! No output f [ "F is true" . ] when ! No output
f [ "F is false" . ] unless ! F is false f [ "F is false" . ] unless ! F is false
2 [ "Two is true" . ] [ "Two is false" . ] if ! Two is true 2 [ "Two is true" . ] [ "Two is false" . ] if ! Two is true
! By default the conditionals consume the value under test, but starred variants ! By default the conditionals consume the value under test, but starred variants
! leave it alone if it's true: ! leave it alone if it's true:
5 [ . ] when* ! 5 5 [ . ] when* ! 5
@ -100,7 +100,7 @@ f [ . ] when* ! No output, empty stack, f is consumed because it's false
! Loops ! Loops
! You've guessed it.. these are higher order words too. ! You've guessed it.. these are higher order words too.
5 [ . ] each-integer ! 0 1 2 3 4 5 [ . ] each-integer ! 0 1 2 3 4
4 3 2 1 0 5 [ + . ] each-integer ! 0 2 4 6 8 4 3 2 1 0 5 [ + . ] each-integer ! 0 2 4 6 8
5 [ "Hello" . ] times ! Hello Hello Hello Hello Hello 5 [ "Hello" . ] times ! Hello Hello Hello Hello Hello
@ -114,7 +114,7 @@ f [ . ] when* ! No output, empty stack, f is consumed because it's false
! Loop reducing or building lists: ! Loop reducing or building lists:
{ 1 2 3 4 5 } [ 2 mod 0 = ] filter ! Keeps only list members for which quotation yields true: { 2 4 } { 1 2 3 4 5 } [ 2 mod 0 = ] filter ! Keeps only list members for which quotation yields true: { 2 4 }
{ 2 4 6 8 } 0 [ + ] reduce . ! Like "fold" in functional languages: prints 20 (0+2+4+6+8) { 2 4 6 8 } 0 [ + ] reduce . ! Like "fold" in functional languages: prints 20 (0+2+4+6+8)
{ 2 4 6 8 } 0 [ + ] accumulate . . ! Like reduce but keeps the intermediate values in a list: prints { 0 2 6 12 } then 20 { 2 4 6 8 } 0 [ + ] accumulate . . ! Like reduce but keeps the intermediate values in a list: prints { 0 2 6 12 } then 20
1 5 [ 2 * dup ] replicate . ! Loops the quotation 5 times and collects the results in a list: { 2 4 8 16 32 } 1 5 [ 2 * dup ] replicate . ! Loops the quotation 5 times and collects the results in a list: { 2 4 8 16 32 }
1 [ dup 100 < ] [ 2 * dup ] produce ! Loops the second quotation until the first returns false and collects the results: { 2 4 8 16 32 64 128 } 1 [ dup 100 < ] [ 2 * dup ] produce ! Loops the second quotation until the first returns false and collects the results: { 2 4 8 16 32 64 128 }
@ -142,7 +142,7 @@ name get-global . ! "Bob"
2 :> c ! Declares immutable variable c to hold 2 2 :> c ! Declares immutable variable c to hold 2
c . ; ! Print it out c . ; ! Print it out
! In a word declared this way, the input side of the stack declaration ! In a word declared this way, the input side of the stack declaration
! becomes meaningful and gives the variable names stack values are captured into ! becomes meaningful and gives the variable names stack values are captured into
:: double ( a -- result ) a 2 * ; :: double ( a -- result ) a 2 * ;
@ -150,7 +150,7 @@ name get-global . ! "Bob"
:: mword2 ( a! -- x y ) ! Capture top of stack in mutable variable a :: mword2 ( a! -- x y ) ! Capture top of stack in mutable variable a
a ! Push a a ! Push a
a 2 * a! ! Multiply a by 2 and store result back in a a 2 * a! ! Multiply a by 2 and store result back in a
a ; ! Push new value of a a ; ! Push new value of a
5 mword2 ! Stack: 5 10 5 mword2 ! Stack: 5 10
! Lists and Sequences ! Lists and Sequences
@ -167,7 +167,7 @@ name get-global . ! "Bob"
"Concat" "enate" append ! "Concatenate" - strings are sequences too "Concat" "enate" append ! "Concatenate" - strings are sequences too
"Concatenate" "Reverse " prepend ! "Reverse Concatenate" "Concatenate" "Reverse " prepend ! "Reverse Concatenate"
{ "Concatenate " "seq " "of " "seqs" } concat ! "Concatenate seq of seqs" { "Concatenate " "seq " "of " "seqs" } concat ! "Concatenate seq of seqs"
{ "Connect" "subseqs" "with" "separators" } " " join ! "Connect subseqs with separators" { "Connect" "subseqs" "with" "separators" } " " join ! "Connect subseqs with separators"
! And if you want to get meta, quotations are sequences and can be dismantled.. ! And if you want to get meta, quotations are sequences and can be dismantled..
0 [ 2 + ] nth ! 2 0 [ 2 + ] nth ! 2