r - Paste values together based on a grouping variable -


i'm new @ r programing , im trying rearrange data frame. have column ids , column y string values. there's more 1 y per id multiple rows same id different y. want 1 row per id , y value concatenated in same cell in other column. there function ? 

original data  id  y   apple b   pear c   grape   grape b   apple c   grape  transformed data    id   y      apple,grape   b    pear, apple   c    grape

you can use aggregate here paste unique elements each idtogether

ggregate(y ~ id, unique(dat), paste, collapse = ", ")

data

dat <- read.table(text="id  y   apple b   pear c   grape   grape b   apple c   grape", header=t)

edit added collapse argument re @pdb comment , changed unique re @davidarenburg


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