One real-world application of functional programming (Mainly immutability) is in Redux's reducers. They receive pure functions (Functions that have a predictable output Y, given an input X) and should always return a new state, not modify the current.
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One real-world application of functional programming (Mainly immutability) is in Redux's reducers. They receive pure functions (Functions that have a predictable output Y, given an input X) and should always return a new state, not modify the current.