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. In this tutorial, you will learn how to use the JavaScript Array reduce () method to reduce an array to a value.
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