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Asked: 2026-06-16T09:50:45+00:00

Must a key be a string or int, or might it be of any

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Must a key be a string or int, or might it be of any object type?

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  1. Editorial Team

    A very-very common type is Symbol, which you didn’t mention. But it can be any object, really.

    class Foo; end

f1, f2 = Foo.new, Foo.new

h = {
  f1 => 3,
  f2 => 4
}

h # => {#<Foo:0x007fed4b04bb00>=>3, #<Foo:0x007fed4b04bad8>=>4}
h[f1] # => 3
h[f2] # => 4
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