flatMap Maps Then Flattens
flatMap Maps Then Flattens
flatMap runs a mapping callback, then flattens one level of arrays from the result. It is useful when each source item can produce several output items.
Without flattening, you would get an array of arrays. With flatMap, downstream code receives one continuous list.
Your task: Use flatMap to create allTags from modules. The result should contain every tag from every module in module order.
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flatMap Maps Then Flattens
flatMap runs a mapping callback, then flattens one level of arrays from the result. It is useful when each source item can produce several output items.
Without flattening, you would get an array of arrays. With flatMap, downstream code receives one continuous list.
Your task: Use flatMap to create allTags from modules. The result should contain every tag from every module in module order.