nwsFindTry-methods: Find a Stored Value (Non-Blocking Version)

In nws: R functions for NetWorkSpaces and Sleigh

Description

Attempt to find a value associated with a variable from the shared netWorkSpace; a non-blocking version of nwsFind.

Usage

## S4 method for signature 'netWorkSpace'
nwsFindTry(.Object, xName, defaultVal=NULL)

Arguments

.Object	a netWorkSpace class object
xName	name of variable to be found
defaultVal	value to return if xName is not found

Details

The nwsFindTry method looks in the shared netWorkSpace .Object for a value bound to xName; if it finds such a value, nwsFindTry returns it but does not remove it. If it does not find a value, nwsFindTry returns immediately, rather than blocking as in the case of nwsFind), and the value of argument defaultVal is returned. By default, defaultVal is NULL.

If there is more than one value associated with xName, the particular value returned depends on xName's behavior. See nwsDeclare for details.

See Also

nwsDeclare, nwsFind

Examples

## Not run: 
ws <- netWorkSpace('nws example')
x <- nwsFindTry(ws, 'abc', -1)

## End(Not run)

nws documentation built on May 2, 2019, 8:51 a.m.