The following picture illustrates the difference between the reduce() and reduceRight() methods: Typically, you use a for loop to iterate over the elements and add them up as shown in the following example: let numbers = įor ( let i = 0 i < numbers.length i++) Suppose that you have an array of numbers, like this: let numbers = Code language: JavaScript ( javascript )Īnd you want to calculate the total of elements of the array. Introduction to the JavaScript Array reduce() method Summary: in this tutorial, you will learn how to use the JavaScript Array reduce() and reduceRight() methods to reduce an array to a value.
