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\(x,y)Reduce(paste0,sapply(el(strsplit(x,"")),\(z)cwhmisc::int2B(grep(z, letters),y))[1,])
With R < 4.1, \ needs to be replaced with function resulting in a total of 104 bytes.
R < 4.1
\
function
-5 bytes thanks to @pajonk.
Try it online!
\(x,y)Reduce(paste0,sapply(el(strsplit(x,"")),\(z)cwhmisc::int2B(grep(z,letters),y))[1,])
\(x,y)pasteReduce(paste0,sapply(el(strsplit(x,"")[[1]]),\(z)cwhmisc::int2B(grep(z, letters),y))[1,],collapse="")
\(x,y)paste(sapply(strsplit(x,"")[[1]],\(z)cwhmisc::int2B(grep(z, letters),y))[1,],collapse="")
library(cwhmisc);\\(x,y)paste(sapply(strsplit(x,"")[[1]],\(z)cwhmisc::int2B(grep(z, letters),y))[1,],collapse="")
library(cwhmisc);\(x,y)paste(sapply(strsplit(x,"")[[1]],\(z)int2B(grep(z, letters),y))[1,],collapse="")
