tryGet: Try to get the value of a symbol if exists or return a...

In rlist: A Toolbox for Non-Tabular Data Manipulation

Description

Try to get the value of a symbol if exists or return a default value

Usage

tryGet(symbol, def = NULL, ..., envir = parent.frame())

Arguments

symbol	the symbol to examine
def	the default value if the symbol does not exist
...	additional parameters passed to exists and get
envir	the environment to examine whether the symbol exists and get the symbol

Details

By default, the symbol is examined in envir without inheritance, that is, if the symbol does not exist in envir the default value def will be returned.

Examples

x <- list(a=c(x=1,y=2),b=c(x=2,p=3))
list.map(x, tryGet(y,0))

Example output

$a
[1] 2

$b
[1] 0

rlist documentation built on Sept. 5, 2021, 5:30 p.m.