Occurrence in array of array

1: [ 36011, 19754, 15711 ],

by vaheed akhtar

JavaScript

var arr = [{1: 36011, 2: 18320, 3: 36011, 4: 10570},
        {1: 19754, 2: 6722, 3: 19754, 4: 6699},
        {1: 15711, 2: 10039, 3: 15711, 4: 4172}]

var output = {}
for(var obj of arr){
    for(var key in obj){
        if(key in output){
            output[key].push(obj[key])
        } else {
            output [key] = [obj[key]]
        }
    }
}
console.log(JSON.stringify(output))