puts numbers.join - The join method returns a string created from the array elements, separated by a provided separator. Again, the question mark has no effect on the array. Suppose you have a string containing words separated by spaces, and you want to “explode” the string into an array of individual letters. By convention, Ruby methods ending with question mark return a boolean value. By combining the map and flatten methods, flatmap can simplify your code and make it more concise. The flat_map method flattens the resulting array, so that it’s a single array of pet objects. The flatmap method is a versatile and powerful tool that can be used to transform and flatten arrays and other collections of data in Ruby. In this example, the flat_map method is used to transform the nested hash into an array of pet objects, where each object contains the name of the pet and the name of its owner.
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