How to map the keys of two arrays of the same length with each other?

user_12818045 0
Viewed 143

I want to map the key of one array to another nested array. Both arrays have the same length.

Before:

const idListToInsert = [{ idToInsert: 1 }, { idToInsert: 3 }, { idToInsert: 4 }];

const otherObjectList = [
  [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }],
  [{ id: 5 }, { id: 6 }, { id: 7 }],
  [{ id: 8 }, { id: 9 }],
];

Target:

const targetList = [
  [
    { id: 1, idToInsert: 1 },
    { id: 2, idToInsert: 1 },
    { id: 3, idToInsert: 1 },
    { id: 4, idToInsert: 1 },
  ],
  [
    { id: 5, idToInsert: 3 },
    { id: 6, idToInsert: 3 },
    { id: 7, idToInsert: 3 },
  ],
  [
    { id: 8, idToInsert: 4 },
    { id: 9, idToInsert: 4 },
  ],
];

I'm having a bit of a hard time finding the starting point for this problem, especially because of the nested structure of the second array.

I am thankful for each hint.

javascript
4 Answers

this is most clear code I could come up with..

const idListToInsert = [{ idToInsert: 1 }, { idToInsert: 3 }, { idToInsert: 4 }];

const otherObjectList = [
  [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }],
  [{ id: 5 }, { id: 6 }, { id: 7 }],
  [{ id: 8 }, { id: 9 }],
];

const result = otherObjectList.map((item, index) => item.map((value) => ({
    ...value,
    ...idListToInsert[index],
})));

console.log(result);

user_91052070

You could map the outer array otherObjectList and their inner arrays and create a new object with additional properties.

const
    idListToInsert = [{ idToInsert: 1 }, { idToInsert: 3 }, { idToInsert: 4 }],
    otherObjectList = [[{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }], [{ id: 5 }, { id: 6 }, { id: 7 }], [{ id: 8 }, { id: 9 }]],
    result = otherObjectList.map((a, i) => a.map(o => ({ ...o, ...idListToInsert[i] })));

console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }

user_14476750 
const targetList = []
otherObjectList.forEach((subarray, index) => {
   const temp = []
   subarray.forEach(id => {
      temp.push({id,  idListToInsert[index]})
   })
   targetList.push(temp)
})

It is untested but it should work.

user_89932530

I hope this code helping you

var targetList = otherObjectList.map((ele,index)=>ele.map(obj=>({...obj, ...idListToInsert[index]})))
console.log(targetList)
user_162279150
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