javascript - Flatten nested objects using Lodash - Stack Overflow

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I'm looping over object with a property set to array, which i then use in the following way:

  let merged= [];
  for (let sup of superObject) {
    let sname = sup.superObjectName;
    for (let sub of sup.subObject) {
      merged.push({superObject: sname, subObject: sub.subObjectName})
    }
  }

Now the code above works and get job done but i feel it can be improved using Lodash and i cant get it to work. i tried using flatMap in few different ways but none seem to work, and the one in the right direction in terms of functionality wont seem like an improvement at all. Any ideas?

UPDATE: superObject example:

{
   superObjectName: "someName",
   subObject: [
      {subObjectName: "someSubName"},
      {subObjectName: "someSubName2"}
    ]
 }

I'm looping over object with a property set to array, which i then use in the following way:

  let merged= [];
  for (let sup of superObject) {
    let sname = sup.superObjectName;
    for (let sub of sup.subObject) {
      merged.push({superObject: sname, subObject: sub.subObjectName})
    }
  }

Now the code above works and get job done but i feel it can be improved using Lodash and i cant get it to work. i tried using flatMap in few different ways but none seem to work, and the one in the right direction in terms of functionality wont seem like an improvement at all. Any ideas?

UPDATE: superObject example:

{
   superObjectName: "someName",
   subObject: [
      {subObjectName: "someSubName"},
      {subObjectName: "someSubName2"}
    ]
 }

• javascript
• lodash

Share Improve this question Follow edited Dec 26, 2018 at 8:44 yariv bar asked Dec 26, 2018 at 8:33 yariv baryariv bar 97633 gold badges2020 silver badges4646 bronze badges 3

• 2 Please add an example of the data you use, and the expected result. – Ori Drori Commented Dec 26, 2018 at 8:34
• Edit your question and add what you are getting in superObject – Just code Commented Dec 26, 2018 at 8:38
• There is Array.prototype.flat, avoid useless libraries to keep the best performance – Szymon D Commented Dec 26, 2018 at 8:55

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 4

This does the same as your code:

const merged = _.flatMap(superObject, ({superObjectName, subObject}) =>
    _.map(subObject, ({subObjectName}) => ({
        superObject: superObjectName,
        subObject: subObjectName
    }))
);

Each value in superObject transformed to Array with map, and then flattened inside flatMap.

You can use flatMap, get props and get the desire result like this using lodash.

var data= [{
   superObjectName: "someName",
   subObject: [
      {subObjectName: "someSubName"},
      {subObjectName: "someSubName2"}
    ]
 }];

const result = _.flatMap(data, ({ superObjectName, subObject}) =>
  _.map(subObject, ({subObjectName})=> ({superObject: superObjectName, subObject: subObjectName}))
);

console.log(result);

<script src="https://cdnjs.cloudflare./ajax/libs/lodash.js/4.17.4/lodash.js"></script>

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