Functional Programming patterns

Hi,
'
Not specific to 'R'. I search for patterns and found
http://patternsinfp.wordpress.com/ which is too heavy for me. There is a
'Pragmatic Programmer' book on such patterns for Scala and Clojure. Is
there anything for R ?

I wanted to code this. Is there a functional pattern in R for multiple
'if' loops like this ?

        if( is.na(str_extract(input,"T[^.]*")[1]) ){

        }else{


Thanks,
Mohan


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