Ruby dig method

dig method

依照 apidock 的說明

dig(*args) public

Extracts the nested value specified 
by the sequence of key objects 
by calling dig at each step, returning nil if any intermediate step is nil.

h = { foo: {bar: {baz: 1}}}
h.dig(:foo, :bar, :baz)       # 1
h.dig(:foo, :zot, :xyz)       # nil

g = { foo: [10, 11, 12] }
g.dig(:foo, 1)             # 11
g.dig(:foo, 1, 0)           # TypeError: Integer does not have #dig method
g.dig(:foo, :bar)           # TypeError: no implicit conversion of Symbol into Integer