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default_proc 

        # Hash.default_proc

(from ruby core)
---
    hash.default_proc -> proc or nil

---

Returns the default proc for `self` (see [Default
Values](#class-Hash-label-Default+Values)):
    h = {}
    h.default_proc # => nil
    h.default_proc = proc {|hash, key| "Default value for #{key}" }
    h.default_proc.class # => Proc

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