Posted On: Dec 24, 2020
Optional chaining is the process of querying, calling properties, subscripts, and methods that may be 'nil'. Since multiple queries to methods, properties, and subscripts are grouped together that failure to one chain will affect the entire chain and results in a 'nil' value. Optional chaining is used to set and retrieve a subscript value that validates whether a call, to that subscript, returns a value.
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