group array of objects by id

Question

I am trying to loop through a array ob objects and group the items of the array into new arrays that have matching id:

API example:

    api_array [
          


        

Answer 1

You could use the ids as properties of an object

let api_array = [
    {id: 1, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 1, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 1, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 2, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 2, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 2, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 3, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 3, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 3, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 4, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 4, postcode: 'xxx', street: 'xxx', city: 'xxx'},
    {id: 4, postcode: 'xxx', street: 'xxx', city: 'xxx'},
];

let grouped = groupArray(api_array);

console.log(grouped);
console.log(grouped[1]);

function groupArray(myArray) {
    let grouped = {};

    for (let i = 0; i < myArray.length; i++) {
        let row = myArray[i];
        let group = grouped[row.id];
        if (!group) {
            group = [];
            grouped[row.id] = group;
        }
        group.push(row);
    }

    return grouped;
}