Web Reference: 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. 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. Jul 11, 2025 · The JavaScript Array.reduce () method iterates over an array, applying a reducer function to each element, accumulating a single output value. It takes an initial value and processes elements from left to right, reducing the array to a single result.
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