Syntax for a for loop in ruby

Question

How do I do this type of for loop in Ruby   for int i 0  i lt array length  i

User · Answer

I keep hitting this as a top link for google  ruby for loop   so I wanted to add a solution for loops where the step wasn t simply  1    For these cases  you can use the  step  method that exists on Numerics and Date objects   I think this is a close approximation for a  for  loop   start   Date new 2013 06 30  stop   Date new 2011 06 30    step back in time over two years  one week at a time start step stop  -7  each do  d       puts d end

User · Answer

limit   array length  for counter in 0  limit  --- make some actions --- end     the other way to do that is the following  3 times do  n    puts n  end   thats will print 0  1  2  so could be used like array iterator also  Think that variant better fit to the author s needs

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What  From 2010 and nobody mentioned Ruby has a fine for  in loop  it s just nobody uses it    ar    1 2 3 4 5 6  for item in ar   puts item end

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To iterate a loop a fixed number of times  try   n times do    Something to be done n times end

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foo    bar    baz   each with index   j  i  puts    i    j

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Ruby s enumeration loop syntax is different   collection each do  item      end   This reads as  a call to the  each  method of the array object instance  collection  that takes block with  blockargument  as argument    The block syntax in Ruby is  do     end  or           for single line statements   The block argument   item   is optional but if provided  the first argument automatically represents  the looped enumerated item

User · Answer

array each index do  i        end   It s not very Rubyish  but it s the best way to do the for loop from question in Ruby

User · Answer

array each do  element    element do stuff end   or   for element in array do   element do stuff end   If you need index  you can use this   array each with index do  element index    element do stuff index  end

User · Answer

If you don t need to access your array   just a simple for loop  you can use upto or each    Upto   1 9 3p392  030  gt  2 upto 4    i  puts i  2 3 4    gt  2    Each   1 9 3p392  031  gt   2  4  each   i  puts i  2 3 4    gt  2  4

User · Answer

The equivalence would be  for i in  0   array size  end   or   0   array size  each do  i  end   or   i   0 while i  lt  array size do    array i     i   i   1   where you may freely set i to any value end

[ruby] Syntax for a for loop in ruby

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