REDCap's API frequently specifies a series of values separated by commas. In the R world, it's easier to keep these values as separate elements in a vector. This functions squashes them together in a single character element (presumably right before the return value is passed to the API)

collapse_vector(elements)

## Arguments

elements

An array of values. Can be NULL. Required.

## Value

A single character element, where the values are separated by commas. Can be blank. (i.e., "").

Will Beasley

## Examples

library(REDCapR) # Load the package into the current R session.
REDCapR:::collapse_vector(elements = NULL   )
#> [1] ""
REDCapR:::collapse_vector(elements = letters)
#> [1] "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z"