vector - Replicate variable based off match of two other variables in R -

i've got seemingly simple question can't answer: i've got 3 vectors:

x <- c(1,2,3,4) weight <- c(5,6,7,8) y <- c(1,1,1,2,2,2) 

i want create new vector replicates values of weight each time element in x matches y such produces following new weight vector associated y:

y_weight <- c(5,5,5,6,6,6)  

any thoughts on how (either loop or vectorized)? thanks

you want match function.

match(y, x) 

to return indicies of matches, use build new weight vector

weight[match(y, x)]