I have a dilemma of which case is more efficient.
I have a javascript array with this structure

elements = 
  [ { id: 'uuid',         children: [] } 
  , { id: 'uuid',         children: [] } 
  , { id: 'uuid',         children: 
      [ { id: 'uuid',     children: [] } 
      , { id: 'uuid',     children: 
          [ { id: 'uuid', children: [] } 
          , { id: 'uuid', children: [] } 
          ] 
        } 
      , { id: 'uuid',     children: [] } 
      ] 
    } 
  ] 

To find a specific object, I have two ways of working, one is to iterate each element until I find it and the other is to convert it to string and if the id exists in the children, I enter the node

function findElementById(id_, elements){
for (el of elements){
    if(el.id == id_) return el
    if(JSON.stringify(el.children).includes(id_)) return findElementById(id, el.children)
}
}

function findElementById(id_, elements){
for (el of elements){
    if(el.id == id_) return el
    if(el.children.length > 0) result = findElementById(id, el.children)
    if (result) return result
}
}

It's efficient to convert to string to avoid entering nodes that will not return anything or in cases where the object is very large, converting to string uses a lot of resources.