R: Create a 'List environment' that wraps given 'data' and most...

List {rlist} | R Documentation

## Create a `List environment` that wraps given `data` and most list functions are defined for chainable operations.

### Description

Create a `List environment` that wraps given `data` and most list functions are defined for chainable operations.

### Usage

    List(data = list())

### Arguments

`data` | A `list` or `vector`

### Details

Most list functions are defined in `List environment`. In addition to these functions, `call(fun,...)` calls external function `fun` with additional parameters specifies in `...`.

To extract the data from List `x`, call `x$data` or simply `x[]`.

### Examples

    x <- list(p1 = list(type='A',score=list(c1=10,c2=8)),
           p2 = list(type='B',score=list(c1=9,c2=9)),
           p3 = list(type='B',score=list(c1=9,c2=7)))
    m <- List(x)
    m$filter(type=='B')$
      map(score$c1) []

    m$group(type)$
      map(g ~ List(g)$
          map(score)$
          call(unlist)$
          call(mean) []) []

    # Subsetting, extracting, and assigning

    p <- List(list(a=1,b=2))
    p['a']
    p[['a']]
    p$a <- 2
    p['b'] <- NULL
    p[['a']] <- 3

[Package rlist version 0.4.6.1 Index]