Deep recursively search object by id from object

deep_search.js

const deep_search = (obj, id) => {
  if (obj) {
    if (obj.constructor === Object) {
      if (obj.id === id) {
        return obj
      } else {
        const keys = Object.keys(obj)
        for(let i = 0; i < keys.length; i++) {
          let r = deep_search(obj[keys[i]], id)
          if (r) return r
        }
      }
    } else if (obj.constructor === Array) {
      for(let i = 0; i < obj.length; i++) {
        let r = deep_search(obj[i], id)
        if (r) return r
      }
      return undefined
    } else {
      return undefined
    }
  } else {
    return undefined
  }
}

const obj = {id: 200, name: "Yolo", others: [{id: 210, name: "Foo"}, {id: 220, name: "Bar"} ]}

console.log(deep_search(obj, 220))