who'se your daddy algorithm, furry braaas funny PaaS

test.js

let organisations = [
    { id: 1, name: "grandaddy", parentId: null },
    { id: 2, name: "daddy", parentId: 1 },
    { id: 3, name: "sister", parentId: 2 },
    { id: 4, name: "brother", parentId: 2 }
]

const myChildId = 4;

function findChild(id) {
    return organisations.find(org => {
        return org.id === id;
    });
}

let currentChild = findChild(myChildId);
const breadCrumb = [];
while(currentChild.parentId != null) {
    breadCrumb.unshift(currentChild);
    currentChild = findChild(currentChild.parentId);
}
breadCrumb.unshift(currentChild);

console.log(breadCrumb);