[Immutability] - State cannot be [modified] after it is [created] i.e. after a data structure has been given a [value], its value cannot be changed. [Statelessness] refers to [functions] that are pure – they can be reasoned about mathematically and always return the same value for a given input. There is no current [state] that can also be altered by the function. Higher-order functions are functions that take other functions as [arguments]..

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