Array#flatten Show archive.org snapshot by default flattens an array recursively. To only flatten the array for e.g. one level, it takes an optional argument.

# Flattens the array recursively
>> [1, [2, [3]]].flatten
=> [1, 2, 3]

# Flattens the array the given number of times
>> [1, [2, [3]]].flatten(1)
=> [1, 2, [3]]

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