diff arrays

diff.coffee

console.clear()

diff =  (a, b) -> 
    deleted = []
    added   = []
    
    # deleted.push item for item in a when b.indexOf(item) is -1
    # added.push item   for item in b when a.indexOf(item) is -1

    clone = b.slice 0
    
    for item, index in a
        if b.indexOf(item) is -1
            deleted.push item
            clone.splice item, 1
        
    added = clone
            
    console.log "added: #{added} deleted: #{deleted}"

diff [1, 2, 3, 4, 5, 6], [0, 12, 1, 4, 7, 8, 9, 10]