has_key?(p1) public

Returns true if the given key is present in hsh.

h = { "a" => 100, "b" => 200 }
h.has_key?("a")   #=> true
h.has_key?("z")   #=> false

Note that include? and member? do not test member equality using == as do other Enumerables.

See also Enumerable#include?

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