Avoiding for loop in RStudio

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 0  1912

I have written 2 codes below,

# code1
for (i in 1:nrow(Y))
{ 
  if(is.na(Y$b[i])) {} else {
    X <-mutate(X, col_new = ifelse(col1 == Y$col1[i] & col2


                      
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