Question

How to use group of objects inside nested array in JavaScript

Answer 1

const array = [[
   {
      key: 7457,
      value: 'javascript'
   }, {
      key: 9287,
      value: 'python'
   }, {
      key: 8692,
      value: 'c'
   }, {
      key: 9012,
      value: 'c++'
   },
], [ 
 {
      key: 7457,
      value: 'c#'
   }, {
      key: 9287,
      value: 'java'
   }, {
      key: 8692,
      value: 'php'
   }, {
      key: 9012,
      value: 'swift'
   },
  ]];

const map = {};

array.forEach(arr => {
   arr.forEach(obj => {
      const { key, value } = obj;
      if (map[key]) {
         map[key].push(value);
      } else {
         map[key] = [value]
      }
   })
});

console.log(map);



/*
run:

{
  7457: ["javascript", "c#"],
  8692: ["c", "php"],
  9012: ["c++", "swift"],
  9287: ["python", "java"]
}

*/

 

70+ SQL courses for beginners and professionals