- * hsh.delete(key) -> value

- * hsh.delete(key) {| key | block } -> value

- * Deletes the key-value pair and returns the value from <i>hsh</i> whose

- * key is equal to <i>key</i>. If the key is not found, it returns

- * <em>nil</em>. If the optional code block is given and the

- * key is not found, pass in the key and return the result of

- * <i>block</i>.

- * h = { "a" => 100, "b" => 200 }

- * h.delete("a") #=> 100

- * h.delete("z") #=> nil

- * h.delete("z") { |el| "#{el} not found" } #=> "z not found"

- * hsh.shift -> anArray or obj

- * Removes a key-value pair from <i>hsh</i> and returns it as the

- * two-item array <code>[</code> <i>key, value</i> <code>]</code>, or

- * the hash's default value if the hash is empty.

- * h = { 1 => "a", 2 => "b", 3 => "c" }

- * h.shift #=> [1, "a"]

- * h #=> {2=>"b", 3=>"c"}

- * hsh.delete_if {| key, value | block } -> hsh

- * hsh.delete_if -> an_enumerator

- * Deletes every key-value pair from <i>hsh</i> for which <i>block</i>

- * evaluates to <code>true</code>.

- * If no block is given, an enumerator is returned instead.

- * h = { "a" => 100, "b" => 200, "c" => 300 }

- * h.delete_if {|key, value| key >= "b" } #=> {"a"=>100}

- * hsh.reject! {| key, value | block } -> hsh or nil

- * hsh.reject! -> an_enumerator

- * Equivalent to Hash#delete_if, but returns

- * <code>nil</code> if no changes were made.

- * hsh.reject {|key, value| block} -> a_hash

- * hsh.reject -> an_enumerator

- * Returns a new hash consisting of entries for which the block returns false.

- *

- * If no block is given, an enumerator is returned instead.

- * h = { "a" => 100, "b" => 200, "c" => 300 }

- * h.reject {|k,v| k < "b"} #=> {"b" => 200, "c" => 300}

- * h.reject {|k,v| v > 100} #=> {"a" => 100}