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Is there a way to do:
a = b.map{ |e| #return multiple elements to be added to a }
Where rather than returning a single object for each iteration to be added to a, multiple objects can be returned.
I'm currently achieving this with:
a = []
b.map{ |e| a.concat([x,y,z]) }
Is there a way to this in a single line without having to declare a = [] up front?
231
The mapper function passed to map() returns a single value for a single input. The function passed to flatmap() operation returns multiple numbers of values as the output.
To return multiple items, use the flatMap() function… A better approach to returning multiples from an array is by using the flatMap() function.
You can return multiple values from a function using either a dictionary, a tuple, or a list. These data types all let you store multiple values.
The map() method returns an entirely new array with transformed elements and the same amount of data. In the case of forEach() , even if it returns undefined , it will mutate the original array with the callback .
Use Enumerable#flat_map
b = [0, 3, 6]
a = b.flat_map { |x| [x, x+1, x+2] }
a # => [0, 1, 2, 3, 4, 5, 6, 7, 8]
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