Перебор имён

scores <- c(ada = 91, bo = 78, cy = 85)
for (name in names(scores)) {
  cat(name, "scored", scores[[name]], "\n")
}

ada scored 91 
bo scored 78 
cy scored 85 

scores <- c(cy = 85, ada = 91, bo = 78)
for (name in sort(names(scores))) {
  cat(name, scores[[name]], "\n")
}

ada 91 
bo 78 
cy 85 

words <- c("red", "blue", "red", "green", "red")
counts <- c()
for (w in words) {
  if (w %in% names(counts)) {
    counts[w] <- counts[w] + 1
  } else {
    counts[w] <- 1
  }
}
print(counts[["red"]])
print(names(counts))

[1] 3
[1] "red"   "blue"  "green"

scores <- c(ada = 91, bo = 78)
lines <- c()
for (name in names(scores)) {
  lines <- c(lines, paste0(name, ": ", scores[[name]]))
}
cat(lines, sep = "\n")

ada: 91
bo: 78