From what I understood, this function would be impure. Because, here, user object is an input for the method. And inside the updateUsername(), we are mutating its value. According to this blog, the function will become impure if we mutate the input.
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From what I understood, this function would be impure. Because, here, user object is an input for the method. And inside the updateUsername(), we are mutating its value. According to this blog, the function will become impure if we mutate the input.