Move objects in array where duplicates occur-CodePudding

I have an array of objects, each array has a key of name and then another array of objects:

const myArray = [ { name: "1", item: [{}] }, { name: "2", item: [{}] }, { name: "1", item: [{}] } ]

Now for example sometimes that name key will be the same, i want to be able to check if that name exists and if it does exist push the item into that array object and not into a new object.

The behaviour im getting is above but i would like:

const myArray = [ { name: "1", item: [{ item1, item2 etc }] }, { name: "2", item: [{}] }, { name: "3", item: [{}] } ]

Thanks so much in advance!

CodePudding user response：

You can get the desired result using Array.reduce(), grouping by name.

If two objects in myArray share the same name, the item values are combined.

const myArray = [ { name: "1", item: [{ id: 1 }] }, { name: "2", item: [{ id: 2}] }, { name: "1", item: [{ id: 3}] } ]

const result = Object.values(myArray.reduce((acc, { name, item }) => { 
    acc[name] = acc[name] || { name, item: [] };
    acc[name].item.push(...item);
    return acc;
}, {}))

console.log('Result:', result)

.as-console-wrapper { max-height: 100% !important; }

CodePudding user response：

Here's a solution using Array.prototype.reduce function.

const myArray = [ { name: "1", item: [{}] }, { name: "2", item: [{}] }, { name: "1", item: [{}] } ];

const output = myArray.reduce((acc, curr) => {
  const index = acc.findIndex(pre => pre.name === curr.name);
  if(index !== -1) {
    acc[index].item = acc[index].item.concat(curr.item);
  } else {
    acc.push(curr);
  }
  
  return acc;
}, []);

console.log(output);