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Amandeep Pasricha14,932 Points
Did we need to specify the default value of the accumulator to be equal to ""?
For example, we write [...arr...curr],---> the initial value of the accumulator is , but wouldn't it be okay to omit the initial value so that by default, the initial value is one the inner rays? Wouldn't that be fine?
Because at the end of the day you just want one array all values separated by commas.
Steven Parker217,494 Points
If you don't supply an initial value, the operation will start with the first element in the accumulator, so the accumulator would not be an array.