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Andrew Craig
August 01, 2020
Programming
3
1.3k
(x) => x + 1
Short talk about adding (x) => x + 1 anonymous functions to R
Andrew Craig
August 01, 2020
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Transcript
(x) => x + 1 Andrew Craig Tokyo.R #87 2020/08/01
(x) => x + 1 Changing R to add new
syntax
Me • Andrew Craig • Data Scientist • GitHub: @andycraig
• Twitter: @andrew_cb2 • Professional: R, Python • Hobby: Clojure, APL
> sapply(c(1, 2), function(x) x + 1) [1] 2 3
> sapply(c(1, 2), function(x) x + 1) [1] 2 3
> sapply(c(1, 2), function(x) x + 1) [1] 2 3
> sapply(c(1, 2), function(x) x + 1) [1] 2 3
long!
Future R? useR! 2020 talk by Luke Tierney (Syntax Extensions
starts at 1:07:00) https://www.youtube.com/watch?v=X_eDHNVceCU&feature=youtu.be
Future R? useR! 2020 talk by Luke Tierney (Syntax Extensions
starts at 1:07:00) https://www.youtube.com/watch?v=X_eDHNVceCU&feature=youtu.be 1. \(x) x + 1 2. @(x) x + 1 3. (x) => x + 1
Future R? 1. \(x) x + 1 # Haskell style
2. @(x) x + 1 # Matlab style 3. (x) => x + 1 # JavaScript style
Future R? 1. \(x) x + 1 # EASY 2.
@(x) x + 1 # EASY 3. (x) => x + 1 # DIFFICULT
Future R? 1. \(x) x + 1 # EASY 2.
@(x) x + 1 # EASY 3. (x) => x + 1 # DIFFICULT
Future R? 1. \(x) x + 1 # EASY 2.
@(x) x + 1 # EASY 3. (x) => x + 1 # DIFFICULT Let’s try it!
How?!?!
R source code doc etc m4 po share src tests
tools ChangeLog config.site configure https://cran.rstudio.com/src/base/R-3/R-3.6.3.tar.gz
R source code appl extra gnuwin32 include library main modules
nmath scripts unix Makefile.in https://cran.rstudio.com/src/base/R-3/R-3.6.3.tar.gz
R source code g_her_glyph.c g_her_metr.h g_jis.h gevents.c gram.c gram.y gram-ex.c
graphics.c grep.c gzio.h identical.c https://cran.rstudio.com/src/base/R-3/R-3.6.3.tar.gz
R source code gram.y???
R source code gram.y??? grammar file
gram.y
gram.y | FUNCTION '(' formlist ')' cr expr_or_assign %prec {
$$ = xxdefun($1,$3,$6,&@$); se | IF ifcond expr_or_assign ELSE expr_or_assign { | FOR forcond expr_or_assign %prec FOR { $$ = xxf | WHILE cond expr_or_assign { $$ = xxwhile($1,$2,$ | expr LBB sublist ']' ']' { $$ = xxsubscript($1,
gram.y: (x) => x + 1
gram.y: (x) => x + 1 "FUNCTION", "'function'", "EQ_ASSIGN", "'='",
"RIGHT_ASSIGN", "'->'", "LBB", "'[['", "FOR", "'for'", "IN", "'in'",
gram.y: (x) => x + 1 "FUNCTION", "'function'", "EQ_ASSIGN", "'='",
"RIGHT_ASSIGN", "'->'", "ANON", "'=>'", "LBB", "'[['", "FOR", "'for'", "IN", "'in'",
gram.y: (x) => x + 1 | '(' SYMBOL ')'
ANON expr_or_assign { $$ = xxfirstformal0($2); mo $$ = xxdefunanon($$,$5,&@$); | '(' SYMBOL EQ_ASSIGN expr ')' ANON expr_or_assign { $$ = xxfirstformal1($2,$4); $$ = xxdefunanon($$,$7,&@$); | '(' formlist ')' ANON expr_or_assign { $$ = xxdefunanon($2,$5,&@$);
gram.y: (x) => x + 1 | '(' SYMBOL ')'
ANON expr_or_assign { $$ = xxfirstformal0($2); mo $$ = xxdefunanon($$,$5,&@$); | '(' SYMBOL EQ_ASSIGN expr ')' ANON expr_or_assign { $$ = xxfirstformal1($2,$4); $$ = xxdefunanon($$,$7,&@$); | '(' formlist ')' ANON expr_or_assign { $$ = xxdefunanon($2,$5,&@$);
By the way … What is this? (y = 3)
By the way … What is this? (y = 3)
=> y + 1 It was a new function!
By the way … What is this? (y = 3)
It was NOT a new function!
By the way … What is this? (y = 3)
It was NOT a new function! DIFFICULT PART
By the way … What is this? (y = 3)
It was NOT a new function! Needs grammar change too
gram.y: (x) => x + 1 gram.y → gram.c
gram.y: (x) => x + 1 gram.y → gram.c $
bison -d src/main/gram.y -o src/main/gram.c
gram.y: (x) => x + 1 gram.y → gram.c $
bison -d src/main/gram.y -o src/main/gram.c Compile $ make
gram.y: (x) => x + 1 gram.y → gram.c $
bison -d src/main/gram.y -o src/main/gram.c Compile $ make Creates R with (x) => x + 1!
Test > sapply(c(1, 2), function(x) x + 1) [1] 2
3
Test > sapply(c(1, 2), function(x) x + 1) [1] 2
3 > sapply(c(1, 2), (x) => x + 1)
Test > sapply(c(1, 2), function(x) x + 1) [1] 2
3 > sapply(c(1, 2), (x) => x + 1) [1] 2 3
Test > sapply(c(1, 2), function(x) x + 1) [1] 2
3 > sapply(c(1, 2), (x) => x + 1) [1] 2 3
Code https://github.com/andycraig/r-anonymous-functions gram.y: +38 lines -6 lines
You can program in R You can program R