Lodash `get` alternative

get.spec.ts

describe('get', () => {
  it('return undefined on non-existent key', () => {
    const res = get({ hello: 'world' }, 'foo');
    expect(res).toBeUndefined();
  });
  it('returns key when nested', () => {
    const res = get({ hello: { world: false } }, 'hello.world');
    expect(res).toEqual(false);
  });
});

get.ts

export const get = <T>(obj: T, path: string): any => {
  const paths: string[] = path.split('.'); // array of path keys
  let currentNode: T = obj; // pointer to current node, start at root
  let value: any = undefined; // placeholder for eventual value

  // Loop nodes of path as pointer
  for (const p of paths) {
    if (typeof currentNode[p] === 'object') {
      // Move pointer if object
      currentNode = currentNode[p];
    } else {
      // Set value if last node
      value = currentNode[p];
    }
  }

  // value returned or undefined if not found
  return value;
};