Enumerating Enumerable: Enumerable#entries / Enumerable#to_a

Enumerating Enumerable

We’re at the dirty dozen now — this is the twelfth entry in Enumerating Enumerable, my series of articles on the methods in that Ruby workhorse, the Enumerable module. In this article, I cover the entries method, also known as the to_a method. I myself prefer to_a to entries, as its meaning is more obvious.

In case you missed any of the previous articles, they're listed and linked below:

  1. all?
  2. any?
  3. collect / map
  4. count
  5. cycle
  6. detect / find
  7. drop
  8. drop_while
  9. each_cons
  10. each_slice
  11. each_with_index

Enumerable#entries / Enumerable#to_a Quick Summary

In the simplest possible terms Turns any collection into an array.
Ruby version 1.8 and 1.9
Expects Nothing.
Returns An array containing the collection's items.'s entry Enumerable#entries / Enumerable#to_a

Enumerable#entries / Enumerable#to_a and Arrays

Converting arrays into arrays isn't terribly useful, but it is possible. Note that the array returned is the same object as the original array!

Enumerable#entries / Enumerable#to_a and Ranges

entries / to_a converts ranges into ascending-order arrays:

Enumerable#entries / Enumerable#to_a and Hashes

When used on a hash, entries / to_a creates an array made up of the items in the hash, converting each hash item into a two-element array, where the first element is the key and the second element is the corresponding value.

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