v0.6

New features

• Add pipeline function to support expression-based pipeline evaluation. (#60)
• Piping to string now cat the string in the console. (#61)
• Question mark now supports binary operation ("message" ? expression) in which
  expression is evaluated while "message" is printed ahead of its value. (#62)

Improvements

• <<- and ->> now correctly perform global assignment in enclosed expression in
  a pipeline. (#65)

v0.5

Completely removed deprecated operators, functions, and usage

• Operators (%:>% and %|>%)
• Closure fun() in Pipe object
• No longer supports -> to build lambda expression

The following notation is NO LONGER supported

data %>>% (df -> lm(mpg ~ cyl + wt, data = df))

Please use formula instead

data %>>% (df ~ lm(mpg ~ cyl + wt, data = df))

Support more flexible assignment

• Support assignment in using ~, <- and -> within ()

# assign to symbol
foo %>>% (~ bar) 
# bar <- foo

# assign and continue piping
foo %>>% (bar <- lm(y ~ x, data = .))
foo %>>% (lm(y ~ x, data = .) -> bar) 
# bar <- lm(y ~ x, data = foo)

# assign only for side effect
foo %>>% (~ bar <- lm(y ~ x, data = .))
foo %>>% (~ lm(y ~ x, data = .) -> bar) 
# bar <- lm(y ~ x, data = foo); foo

v0.4

What's new in 0.4?

• Major API Change: %>>% operator now handles all pipeline mechanisms and other operators are deprecated.
• Add Pipe object that supports object-based pipeline operation.

Usage

%>>%

The form of the object following %>>% determines which piping mechanism is used. If the operator is followed by, for example,

Usage	As if
x %>>% f	f(x)
x %>>% f(...)	f(x,...)
x %>>% { f(.) }	f(x)
x %>>% ( f(.) )	f(x)
x %>>% (i -> f(i))	f(x)
x %>>% (i ~ f(i))	f(x)

Pipe()

Pipe() creates a Pipe object that supports light-weight chaining using internal operators. For example,

Usage	Description
Pipe(x)$foo()$bar()	Build Pipe object for chaining
Pipe(x)$foo()$bar() []	Extract the final value
Pipe(x)$fun(expr)	Pipe to .
Pipe(x)$fun(x -> expr)	Pipe to x
Pipe(x)$fun(x ~ expr)	Pipe to x

v0.3

Major operator change

To avoid naming conflict with magrittr package (issue #12), the first-argument pipe operator is changed to %>>% and free pipe operator with dot is changed to %:>%. Now the three operators are:

First-argument piping: %>>%
Free piping: %:>%
Lambda piping: %|>%

Now this package can perfectly coexist with magritter and dplyr but is not backward compatible with previous code if old operators are used, please notify the potential issues and upgrade to the new set of operators if possible.

v0.2

1. Add lambda piping %|>%

mtcars %|>%
  (df -> lm(mpg ~ ., data=df))

1. %>>% no longer allows naked function calling

rnorm(100,10,1) %>>% log %>>% diff

is no longer allowed. You should always use %>% to call by function name like

rnorm(100,10,1) %>% log %>% diff