Web Reference: Jul 20, 2025 · The reduce() method of Array instances executes a user-supplied "reducer" callback function on each element of the array, in order, passing in the return value from the calculation on the preceding element. The final result of running the reducer across all elements of the array is a single value. Subtract all numbers in an array: Round all the numbers and display the sum: The reduce() method executes a reducer function for array element. The reduce() method returns a single value: the function's accumulated result. The reduce() method does not execute the function for empty array elements. Nov 29, 2023 · To remove duplicates using the reduce() method, you need to declare an array as the accumulator value. In each iteration, check if the item is already included in the accumulator using the includes() method.
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