Devtips daily javascript flatmap array method

the `flatmap` method in javascript is a powerful array function that combines the functionality of `map` and `flat`. it allows you to first transform each element of an array using a mapping function and then flatten the resulting array one level deep. this is particularly useful when dealing with nested arrays or when you want to simplify the structure of the data after transformation.

when you use `flatmap`, you can avoid the need for a separate `flat` call, making your code cleaner and more efficient. it enhances readability by allowing you to express what you want to achieve in a single step. the method returns a new array, leaving the original array unchanged. introduced in ecmascript 2019, `flatmap` is now widely supported in modern javascript environments, making it a valuable addition for developers looking to streamline their array manipulations.
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