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Operators and functions for working with arrays (arr type) are described here. arr.typename means that you can specify any type name but in the case of the binary operator this type must be the same in both arrays.
The bool function returns false if the array is empty, otherwise, it returns true.
The Join function joins strings of the array. The separator string sep is placed between strings in the resulting string.
The Reverse function reverses the order of the elements in the array and returns this array.
The Slice function copies some consecutive elements from within an array. start is inclusive, while end is exclusive. The function returns the created array.
The Sort function sorts an array of strings in increasing order and returns it.