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.

There is nice Array method reduce() to get one value from the Array. Example: [0,1,2,3,4].reduce(function(previousValue, currentValue, index, array){ return ...

Sure reduce takes in a function to perform operations on each of the elements in an array. Every time it returns a value that is used as the next 'a' variable in the operation.

I have this code for a class where I'm supposed to use the reduce() method to find the min and max values in an array. However, we are required to use only a single call to reduce. The …

Dec 13, 2014 · 1481 Recommended (reduce with default value) Array.prototype.reduce can be used to iterate through the array, adding the current element value to the sum of the previous …

Aug 27, 2016 · I am trying to figure out a way to conditionally break out of an iteration when using JavaScript's reduce function. Given the following code sums an array of integers and will …

Jul 20, 2017 · Keep in mind that using filter and then reduce introduces additional full iteration over array records. Using only reduce with else branch, like in the other answers, avoids this …

For the reduce folks it's fun to feel cool writing tiny code but for example if the array had 1000 one element subarrays all the reduce+concat solutions would be doing 500500 operations where …

Mar 22, 2016 · The answer is you cannot break early from reduce , you'll have to find another way with builtin functions that exit early or create your own helper, or use lodash or something. Can …

The problem is that your accumulator values are promises - they're return values of async function s. To get sequential evaluation (and all but the last iteration to be awaited at all), you …