forKeyVal: forKeyVal - Looping named lists

In gmDatabase: Accessing a Geometallurgical Database with R

Description

forKeyVal loops a named list or vector, with one variable bound to the key and another to the value.

Usage

forKeyVal(key,val,LIST,block,envir=parent.frame())

Arguments

key	the variable to be bound by the name of the element of the LIST
val	the variable to be bound by the value of the element of the LIST
LIST	a list
block	the block to be exectued, with this variables bound
envir	the environment in which the variables are bound and the block is executed

Details

It works much like a for(val in LIST) block with the difference. It however additionally binds key to the value name of the list element, but does not recognize continue or break statements. This might change at some point in future.
Empty or unbound names result in a binding of key to NULL.

Value

the value of the last execution of the block

Author(s)

K. Gerald van den Boogaart

See Also

for, lapply

Examples

forKeyVal(name,x,c(a=1,b=5,c=6),{
  cat(name,"=>",x,"\n")
})

forKeyVal(name,x,list(a=4,b=1:7,c=c(a="Aber",b="nicht")), {
  cat(name,"\n",sep="")
  if(is.null(names(x)))
    names(x) <- 1:length(x)
  forKeyVal(iname,x,x,{
    cat(name,".",iname,"=>",x,"\n",sep="")
  })
})

Example output

Loading required package: DBI
Loading required package: RMySQL
Loading required package: foreach
Loading required package: digest
Loading required package: shiny
gmDatabase: Working with geometallurgical databases,  Version: 0.5.0
a => 1 
b => 5 
c => 6 
a
a.1=>4
b
b.1=>1
b.2=>2
b.3=>3
b.4=>4
b.5=>5
b.6=>6
b.7=>7
c
c.a=>Aber
c.b=>nicht

gmDatabase documentation built on May 2, 2019, 9:31 a.m.