有没有一种方法可以在数组的每个元素前加上某些内容。
例如:
例如:
file = File.new(my_file,'r')
header = IO.readlines(my_file)[1] # header looks like [1,2,3]
#Prepend each elelement of header with filename, something like
header.prepend(filename+".") #header looks like [filename.1,filename.2,filename.3]