Add items to array while looping without causing infinite loop?

Question

I' trying to add duplicate items to an array while looping through it:

Adding it to the end causes an infitie loop:

  site.pages.each do |page|
    new_page = page.dup
    new_page.data['permalink'] = File.join('/app', page.url)
    puts new_page.data['permalink']
    puts ''
    site.pages << new_page
  end

so does adding it to the beginning.

  site.pages.each do |page|
    new_page = page.dup
    new_page.data['permalink'] = File.join('/app', page.url)
    puts new_page.data['permalink']
    puts ''
    site.pages.unshift(new_page)
  end

Create a copy and add to that instead?

Easton Bornemeier
– Easton Bornemeier

2018-07-11 14:45:37 +00:00
Commented Jul 11, 2018 at 14:45 — Easton Bornemeier
– Easton Bornemeier, Commented Jul 11, 2018 at 14:45
Possible duplicate of Adding to an Array while Iterating

jon1467
– jon1467

2018-07-11 14:46:53 +00:00
Commented Jul 11, 2018 at 14:46 — jon1467
– jon1467, Commented Jul 11, 2018 at 14:46

spickermann · Accepted Answer · 2018-07-11 15:07:12Z

1

I would create all the duplicates first and then add them to the array in a second step.

new_pages = site.pages.map do |page|
  new_page = page.dup
  new_page.data['permalink'] = File.join('/app', page.url)
end
site.pages += new_pages

answered Jul 11, 2018 at 15:07

spickermann

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