Counting the occurrence of a word but only once per row (R)

I want to count the number of times a word appears but only once per row. How do I complete the code?

library(stringr)

var1 <- c("x", "x", "x", "x", "x", "x", "y", "y", "y", "y")
var2 <- c("x", "x", "b", "b", "c", "d", "e", "y", "g", "h")
var3 <- c("x", "x", "b", "b", "c", "d", "e", "y", "g", "h")
data <- data.frame(cbind(var1, var2, var3))

sum(str_count(data, "x"))

The result should be 6.

>Solution :

The following should do the trick:

sum(rowSums(data == "x") >= 1) # Thanks Maël
# [1] 6

which will check if there is at least one value per row (rowSums()) and add all the rows with 1+ up using sum()

Or alternatively (per Antreas’s comment so it is not missed):

length(which(rowSums(data == "x") != 0)) # Thanks to Antreas Stefopoulos

Which counts the number of non-zero rows with.