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delete 

        # Hash.delete

(from ruby core)
---
    hash.delete(key) -> value or nil
    hash.delete(key) {|key| ... } -> object

---

Deletes the entry for the given `key` and returns its associated value.

If no block is given and `key` is found, deletes the entry and returns
the associated value:
    h = {foo: 0, bar: 1, baz: 2}
    h.delete(:bar) # => 1
    h # => {:foo=>0, :baz=>2}

If no block given and `key` is not found, returns `nil`.

If a block is given and `key` is found, ignores the block, deletes the
entry, and returns the associated value:
    h = {foo: 0, bar: 1, baz: 2}
    h.delete(:baz) { |key| raise 'Will never happen'} # => 2
    h # => {:foo=>0, :bar=>1}

If a block is given and `key` is not found, calls the block and returns
the block's return value:
    h = {foo: 0, bar: 1, baz: 2}
    h.delete(:nosuch) { |key| "Key #{key} not found" } # => "Key nosuch not found"
    h # => {:foo=>0, :bar=>1, :baz=>2}

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.