Ruby - Array Arrays Iterating
Introduction
You can access the elements of an array by iterating over them using a for loop.
In Ruby, to for loop over all the items in a collection, use for..in loop.
Demo
multiarr = [['one','two','three','four'],[1,2,3,4]] for i in multiarr puts(i.inspect) # w w w . j av a2s . co m end
Result
To iterate over the items in each of the two subarrays.
If there is a fixed number of items, you could specify a different iterator variable for each, in which case each variable will be assigned the value from the matching array index.
Demo
multiarr = [['one','two','three','four'],[1,2,3,4]] for (a,b,c,d) in multiarr print("a=#{a}, b=#{b}, c=#{c}, d=#{d}\n" ) end# ww w .ja va 2s. c o m
Result
You could use a for loop to iterate over all the items in each subarray individually:
Demo
multiarr = [['one','two','three','four'],[1,2,3,4]] for s in multiarr[0] puts(s) # ww w .ja v a 2s . com end for s in multiarr[1] puts(s) end
Result
To iterate over multidimensional arrays, you could use nested for loops.
An outer loop iterates over each row (subarray), and an inner loop iterates over each item in the current row.
This technique works even when subarrays have varying numbers of items:
Demo
multiarr = [['one','two','three','four'],[1,2,3,4]] for row in multiarr for item in row puts(item) # from w ww.jav a 2 s. c o m end end
Result