On 2013-May-23, at 05:24 , Ajit Teli wrote:
> Can anyone help me on how to skip index in ARRAY.each_with_index loop?
>
> Please look at below case:
>
> In a ARRAY.each_with_index loop, I would like increase the index by 10
> whenever a condition is met.
>
> arr is array of numbers from 0 to 50
> arr.each_with_index do |x,i|
> if i % 10 == 0
> puts "#{x} at #{i}"
> i = i+10 //index increased by 10
> end
> end
>
> The output should be:
> 10 at 10
> 30 at 30
> 50 at 50
>
> Thanks
> Ajit
You need to think about what you really need to do, look at the options to use
select or reject/delete_if, or take the time to understand what next does. Of
course, you don't seem to have even tried to run your code since your output
lacks "0 at 0".
-Rob
For example:
irb2.0.0> arr = (0..50).to_a
#2.0.0 => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50]
irb2.0.0> arr.each_with_index do |element,index|
?> next unless index % 10 == 0
irb2.0.0> puts "#{element} at #{index}"
irb2.0.0> end
0 at 0
10 at 10
20 at 20
30 at 30
40 at 40
50 at 50
#2.0.0 => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50]
irb2.0.0> arr.each.with_index.select {|element,index| index % 10 == 0}.each
do |element,index|
?> puts "#{element} at #{index}"
irb2.0.0> end
0 at 0
10 at 10
20 at 20
30 at 30
40 at 40
50 at 50
#2.0.0 => [[0, 0], [10, 10], [20, 20], [30, 30], [40, 40], [50, 50]]
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