Array of objects , group by parent's object

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I've got an array of objects. I want to be able to group objects in parent's object , parent object is determined by broker: true. Is there a way to convert this:

const data = [
    { id: 1, broker: true },
    { id: 2, broker: false },
    { id: 3, broker: false },
    { id: 4, broker: true },
    { id: 5, broker: false },
    { id: 6, broker: true },
    { id: 7, broker: false },
    { id: 8, broker: false },
    { id: 9, broker: false },
  ];

Into something like this:

const data = [
    { id: 1, broker: true, chunks: [
      { id: 2, broker: false },
      { id: 3, broker: false },
    ]},
    { id: 4, broker: true, chunks: [
      { id: 5, broker: false },
    ]},
    { id: 6, broker: true, chunks: [
      { id: 7, broker: false },
      { id: 8, broker: false },
      { id: 9, broker: false },
    ]},
  ];

You could check the propery for broker and push either a new object to the result set, or push the object to the previous object's chunks array.

const
    data = [{ id: 1, broker: true }, { id: 2, broker: false }, { id: 3, broker: false }, { id: 4, broker: true }, { id: 5, broker: false }, { id: 6, broker: true }, { id: 7, broker: false }, { id: 8, broker: false }, { id: 9, broker: false }],
    grouped = data.reduce((r, o) => {
        if (o.broker) {
            r.push(Object.assign({}, o, { chunks: [] }));
        } else {
            r[r.length - 1].chunks.push(o);
        }
        return r;
    }, []);

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

How to group an array of objects by key, Timo's answer is how I would do it. Simple _.groupBy , and allow some duplications in the objects in the grouped structure. However the OP also asked for the  Assuming array.sort () take f (n) amount of time when sorting by parent asc for an array of length n, I'm doing some performance analysis for the implementation as below. Best case: f ( n) + x × n + y × ∑ ( 1 n 2) × n. Worst case: f ( n) + x × n + y × ∑ ( 1 n) × n.

Use reduce to add to an accumulator every time it runs into a true value, and if it runs into a false value, add to the previous object via the property chunks

data.reduce((a, cv) => {
 let len = a.length - 1;
 return  (cv["broker"]) ? (a.push(cv), a) : (a[len] 
 ["chunks"] || (a[len]["chunks"] = []), a[len] 
 ["chunks"].push(cv), a);
}, []);

const data = [
    { id: 1, broker: true },
    { id: 2, broker: false },
    { id: 3, broker: false },
    { id: 4, broker: true },
    { id: 5, broker: false },
    { id: 6, broker: true },
    { id: 7, broker: false },
    { id: 8, broker: false },
    { id: 9, broker: false },
  ];

let result = data.reduce((a, cv) => {
let len = a.length - 1;
return  (cv["broker"]) ? (a.push(cv), a) : (a[len]["chunks"] || (a[len]["chunks"] = []), a[len]["chunks"].push(cv), a);
}, []);

console.log(result);

javascript group by property array of objects Code Example, “javascript group by property array of objects” Code Answer js an array of objects how to group some field where those array have same key with javascript get origin url · javascript get parent element · javascript get query  I've got an array of objects. I want to be able to group objects in parent's object , parent object is determined by broker: true. Is there a way to convert this: const data = [ { id: 1, broker:

You have to go through the array, create a new one and evaluate the condition you need, if it is met, put it in the new array

Object.keys(data).forEach((value, index) => {

  // code

})

Array a Group of objects?, Select faces. Finally, select your group object then your plane, and hit Ctrl - P to parent them, selecting Object. Select all the objects you want to multiply. Make linked duplicates with Alt - D and place them at the proper distance. Either flatten the objects first, like { brand: 'Audi', color_value: 'black' } or pass a function taking each object in the array, returning the desired value on that object. Eg. instead of const value = obj[key] do const value = keyFn(obj) .

You are going through the keys of each object

Object.keys(data).forEach(key => {
  console.log(data[index].property)
})

Create a nested array recursively in Javascript, Let's say you have an array like this: [ {id: 1, title: 'hello', parent: 0}, {id: title: '​hello', parent: 2} ] And you want to have the objects nested like this: Array.prototype.groupBy = function(prop) { } In Javascript we can declare our very own methods on objects. This means that we will be able to call our new groupBy () on any array object like <Array>.groupBy (prop). The prop will be the name of the property we want to group by.

Head First PHP & MySQL: A Brain-Friendly Guide, accessing object data Drill into XML data with objects Getting back to Owen, group, and entry objects, which form a parent-child relationship from one to The value of the seconds attribute is then retrieved from the array. object (​element). The List of BlogPost objects: List<BlogPost> posts = Arrays.asList( ); Let's also define a Tuple class that will be used to group posts by the combination of their type and author attributes: class Tuple { BlogPostType type; String author; } 2.2. Simple Grouping by a Single Column

How to simplify your codebase with map(), reduce(), and filter() in , Create an object that contains the frequency of the specified key. Let's group and count the 'age' property for each item in the array: const users  I have a class which contains a reference to a parent of the same type( or null if it has no parent). class MyObject{ private MyObject parent; public MyObject getParent(){ return parent}; … } I have a list of MyObject, and need to order it so that every object comes after its parent in the list (the parent will always be in the list).

Bridging Relational and NoSQL Databases, clause forms groups based on relation (for example: friend, parent, cousin) to The GROUP BY forms groups according to each relation (for example: friend, A pathis predominantly used with arrays or nested objects to get the attributes  Thanks to Paweł Wolak, here is a shorter way without Array.reduce: let flat = [].concat.apply([], nested); Also Array.flat is coming, but it’s still an experimental feature. 6. Create an object that contains the frequency of the specified key. Let’s group and count the ‘age’ property for each item in the array:

Comments
  • where is you specific problem?
  • @NinaScholz what do you mean? I want to be able to group objects in parent's object. I cant achieve that kind of grouping.
  • have you tried anything?
  • @NinaScholz Of course , that's why asked , thanks for the right answer anyway.
  • "Of course , that's why asked" - Then why didn't you post your code? Just copy&pasting the answer from somebody won't help you understand what you've done wrong.
  • Object.keys() for an array? O.o
  • Object.keys(data).forEach(key => { console.log(data[key].property) })
  • Like the Object in Object.keys already suggests, is this method for objects and not for arrays.
  • Why the same "answer" twice?
  • Remember that it is an array of objects therefore you can use foreach