JavaScript How to group an array based on a key and create a dynamic object with grouped array as values? group array based on value javascript,group array based on

You could reduce the array by taking a default array and push the item.

var items = [{ title: 'title1' }, { title: 'title1' }, { title: 'title2' }],
    result = items.reduce((r, item) => {
        (r[item.title] = r[item.title] || []).push(item);
        return r;
    }, {});
    
console.log(result);
Answer:1

You've got the correct idea. The itemArray you created is not a multidimensional array. It's an object with each title as key and an array of items which share the same title as their value. You could probably simplify your forEach like this:

var items = [{
  uid: 1,
  title: 'booktitle',
  description: 'description'
}, {
  uid: 2,
  title: 'booktitle',
  description: 'description 2'
}, {
  uid: 1,
  title: 'booktitle 2',
  description: 'description'
}]

let itemArray = {}
items.forEach(item => {
  itemArray[item.title] = itemArray[item.title] || [];
  itemArray[item.title].push(item)
})

console.log(itemArray)
Answer:2

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