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. Description 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. The reduce() method does not change the original array. Nov 29, 2023 · The reduce() method got its name from the functionality it provides, which is to iterate and “reduce” an array's values into one value. The easiest way to understand how the reduce() method works is through an example, so let’s see an easy one first.
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