Web Reference: Reduce function does not reduce anything. Reduce is the function to take all the elements of an array and come out with a single value out of an array. All of the above answers have explained the arr.reduce() for addition only, what if I want to perform something else with the reduce, like subtraction, multiplication etc. 4 An object can be turned into an array with: Object.entries (), Object.keys (), Object.values (), and then be reduced as array. But you can also reduce an object without creating the intermediate array. I've created a little helper library odict for working with objects. As you can see, the reduce method executes the call back function multiple times. For each time, it takes the current value of the item in the array and sum with the accumulator.
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