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What is a 'semantic predicate' in ANTLR?
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170
ANTLR 4
For predicates in ANTLR 4, checkout these stackoverflow Q&A's:
Syntax of semant...
How to show line number when executing bash script
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157
You mention that you're already using -x. The variable PS4 denotes the value is the prompt pr...
Int or Number DataType for DataAnnotation validation attribute
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edited Oct 23 '17 at 9:46
Nisarg
12.6k55 gold badges2929 silver badges4848 bronze badges
answ...
Formatting Numbers by padding with leading zeros in SQL Server
We have an old SQL table that was used by SQL Server 2000 for close to 10 years.
13 Answers
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Ruby on Rails console is hanging when loading
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edited Sep 7 '19 at 11:45
Peter Mortensen
26.5k2121 gold badges9292 silver badges122122 bronze badges
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What does .SD stand for in data.table in R
...his is your data.table:
DT = data.table(x=rep(c("a","b","c"),each=2), y=c(1,3), v=1:6)
setkey(DT, y)
DT
# x y v
# 1: a 1 1
# 2: b 1 3
# 3: c 1 5
# 4: a 3 2
# 5: b 3 4
# 6: c 3 6
Doing this may help you see what .SD is:
DT[ , .SD[ , paste(x, v, sep="", collapse="_")], by=y]
# y V1
# 1...
How to draw polygons on an HTML5 canvas?
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165
Create a path with moveTo and lineTo (live demo):
var ctx = canvas.getContext('2d');
ctx.fill...
Replace Default Null Values Returned From Left Outer Join
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139
That's as easy as
IsNull(FieldName, 0)
Or more completely:
SELECT iar.Description,
ISN...
How to create a drop shadow only on one side of an element?
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15 Answers
15
Active
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JavaScript seconds to time string with format hh:mm:ss
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