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Maintenance Ruby 3.4 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

StringIO#closed_write?

() -> bool
closed_write? → true or false

Returns true if self is closed for writing, false otherwise.

See also #closed_read? #close_read #closed? #close_write also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0