### Installing rlist from GitHub in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This code snippet demonstrates how to install the latest development version of the rlist package directly from the GitHub repository using the devtools package. This requires the devtools package to be installed.

```R
devtools::install_github("renkun-ken/rlist")
```

--------------------------------

### Installing rlist from CRAN in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This code snippet shows the standard way to install the rlist package from the Comprehensive R Archive Network (CRAN). This is the recommended method for installing the stable release version.

```R
install.packages("rlist")
```

--------------------------------

### Chaining rlist Operations with List Environment in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This snippet demonstrates an alternative way to chain rlist operations using the List() function, which wraps a list in an environment providing method-like access to rlist functions. It performs the same filtering, selection, and stacking as the pipeline example.

```R
ldevs <- List(devs)
ldevs$filter("music" %in% interest & "r" %in% names(lang))$
  select(name,age)$
  stack()$
  data
```

--------------------------------

### Load rlist and Define Sample List in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This snippet loads the rlist package into the current R session and defines a sample list named 'devs'. This list represents non-tabular data about developers, including nested lists and vectors, used for demonstrating rlist functions.

```R
library(rlist)
devs <-
  list(
    p1=list(name="Ken",age=24,
      interest=c("reading","music","movies"),
      lang=list(r=2,csharp=4)),
    p2=list(name="James",age=25,
      interest=c("sports","music"),
      lang=list(r=3,java=2,cpp=5)),
    p3=list(name="Penny",age=24,
      interest=c("movies","reading"),
      lang=list(r=1,cpp=4,python=2)))
```

--------------------------------

### Demonstrating Lambda Expressions in rlist in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This snippet defines a simple list 'nums' and then illustrates different forms of lambda expressions supported by rlist functions like list.map and list.filter. It shows implicit lambda (.), univariate (x ~), and multivariate (f(x,i) ~) syntax.

```R
nums <- list(a=c(1,2,3),b=c(2,3,4),c=c(3,4,5))
list.map(nums, c(min=min(.),max=max(.)))
list.filter(nums, x ~ mean(x)>=3)
list.map(nums, f(x,i) ~ sum(x,i))
```

--------------------------------

### Filtering a List using rlist::list.filter in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This code snippet demonstrates how to use the list.filter function from rlist to select elements (developers) from the 'devs' list based on complex criteria: liking 'music' and having 3 or more years of experience with R (lang$r >= 3). The result is a new list containing only the matching elements.

```R
str( list.filter(devs, "music" %in% interest & lang$r >= 3) )
```

--------------------------------

### Mapping a List using rlist::list.map in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This code demonstrates the use of the list.map function to transform each element of the 'devs' list into a single value, in this case, the number of interests associated with each developer. The result is a list of integer values.

```R
str( list.map(devs, length(interest)) )
```

--------------------------------

### Chaining rlist Operations with Pipeline (`|>`) in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This code snippet shows how to chain rlist functions using R's native pipe operator (`|>`). It filters the 'devs' list, selects specific fields, and then stacks the result into a data frame, demonstrating a fluent data processing workflow.

```R
devs |> 
  list.filter("music" %in% interest & "r" %in% names(lang)) |>
  list.select(name,age) |>
  list.stack()
```

--------------------------------

### Selecting Elements from a List using rlist::list.select in R

Source: https://github.com/renkun-ken/rlist/blob/master/README.md

This snippet shows how to use the list.select function to extract specific fields (name and age) from each element (developer) in the 'devs' list. The output is a new list where each element is a sub-list containing only the selected fields.

```R
str( list.select(devs, name, age) )
```

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