reduce javascript

const sum = array.reduce((accumulator, element) => {
  return accumulator + element;
}, 0);
// An example that will loop through an array adding
// each element to an accumulator and returning it
// The 0 at the end initializes accumulator to start at 0
// If array is [2, 4, 6], the returned value in sum
// will be 12 (0 + 2 + 4 + 6)

const product = array.reduce((accumulator, element) => {
  return accumulator * element;
}, 1);
// Multiply all elements in array and return the total
// Initialize accumulator to start at 1
// If array is [2, 4, 6], the returned value in product
// will be 48 (1 * 2 * 4 * 6)

0
4
John Rees 120 points

                                    //note idx and sourceArray are optional
const sum = array.reduce((accumulator, element[, idx[, sourceArray]]) => {
	//arbitrary example of why idx might be needed
	return accumulator + idx * 2 + element 
}, 0);

0
0
3.8
5

                                     let sum = arr.reduce((curr, index) => curr + index);

3.8 (5 Votes)
0
3.75
8
Jedians 100 points

                                    function reduce(array, func, seed) {
  let previousResult;
  if (seed === undefined) {
    previousResult = array[0];
    for (let i = 1; i < array.length; i++) {
      previousResult = func(previousResult, array[i], i, array);
    }
    console.log(previousResult);
  } else {
    previousResult = seed;
    each(array, function(e, i, a) {
      previousResult = func(previousResult, e, i, array);
    });
  }
  return previousResult;
};

3.75 (8 Votes)
0
4.67
3
KIMKU 80 points

                                    /* this is our initial value i.e. the starting point*/
const initialValue = 0;

/* numbers array */
const numbers = [5, 10, 15];

/* reducer method that takes in the accumulator and next item */
const reducer = (accumulator, item) => {
  return accumulator + item;
};

/* we give the reduce method our reducer function
  and our initial value */
const total = numbers.reduce(reducer, initialValue)

4.67 (3 Votes)
0
4
8
Compendium 95 points

                                    
array.reduce(function(total, currentValue, currentIndex, arr), initialValue)

4 (8 Votes)
0
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