JavaScript How to merge array with value sum merge array with same key in php,merge array with

Sorry this is basic things but I dont know java-script array

I have simple array with same number of index and n number of array, If index have no value it will be null

Array [
        0: Array [ null, 10222, 10222, null,9999 ]
        1: Array [ 1870963, 1845801, 1830263, null, null ]
        2: Array [ 1870963, 1845801, 1830263, null, null ]
        n: Array [ n, n, n, n, n ]
    ];

So I need to make in in single array with sum just like below.

Array [3741926,3701824,3670748,0,9999];

Just need to make sum and into single array.

Answer:1

Iterate the array with Array#map, and sum each column using Array#reduce:

var arr = [
  [null, 10222, 10222, null, 9999],
  [1870963, 1845801, 1830263, null, null],
  [1870963, 1845801, 1830263, null, null],
];

var result = arr[0].map(function(a, i) {
  return arr.reduce(function(s, n) {
    return s + n[i];
  }, 0);
});

console.log(result);
Answer:2

You can use reduce like so:

const a = [
        [ null, 10222, 10222, null,9999 ],
        [ 1870963, 1845801, 1830263, null, null ],
        [ 1870963, 1845801, 1830263, null, null ]
    ];
    
console.log(a.reduce((acc, cur) => acc.map((x, i) => x + cur[i])))
Answer:3

I have a project, where I use react-redux, and I have a reducer, which by idea should add one element in array and return new array. How I can do this? /*---- Reducer ----*/ case ...

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