Ruby enumerable block variable assignment

Question

Given this ERB code

<% @client.sessionables.ordered.by_program_completion.reverse_each do | program_name_and_completion, sessionables | %>
  <% program_name, program_completion_date = program_name_and_completion %>

  <% # Render stuff... %>
<% end %>

I would like to get rid of the second line, where I use the multiple variable assignment to extract program_name and program_completion_date from the program_name_and_completion array. One would assume it could be done directly in the block assignment, e.g.

sessionables.by_program_completion.each do | [program_name, program_completion_date], sessionables |

but the above snippet doesn't work, so my questions are:

Is this at all possible with Ruby?
If so, what's the correct syntax?

Tom Lord · Accepted Answer · 2020-01-24 16:55:40Z

2

You can extract the arguments inline as follows:

<% @client.sessionables.ordered.by_program_completion.reverse_each do |(program_name, program_completion_date), sessionables| %>

Or to write the same thing using less verbose syntax (so it's easier to see what's going on!!):

[[[1, 2], 3]].each { |(a, b), c| ... }

Inside the block, we get: a == 1, b == 2, c == 3.

answered Jan 24, 2020 at 16:55

Tom Lord

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