Function updateFromMap

dash/deps/react-dom@18.3.1.js:13460–13506

(existingChildren, returnFiber, newIdx, newChild, lanes)

    }

    function updateFromMap(existingChildren, returnFiber, newIdx, newChild, lanes) {
      if (typeof newChild === 'string' && newChild !== '' || typeof newChild === 'number') {
        // Text nodes don't have keys, so we neither have to check the old nor
        // new node for the key. If both are text nodes, they match.
        var matchedFiber = existingChildren.get(newIdx) || null;
        return updateTextNode(returnFiber, matchedFiber, '' + newChild, lanes);
      }

      if (typeof newChild === 'object' && newChild !== null) {
        switch (newChild.$$typeof) {
          case REACT_ELEMENT_TYPE:
            {
              var _matchedFiber = existingChildren.get(newChild.key === null ? newIdx : newChild.key) || null;

              return updateElement(returnFiber, _matchedFiber, newChild, lanes);
            }

          case REACT_PORTAL_TYPE:
            {
              var _matchedFiber2 = existingChildren.get(newChild.key === null ? newIdx : newChild.key) || null;

              return updatePortal(returnFiber, _matchedFiber2, newChild, lanes);
            }

          case REACT_LAZY_TYPE:
            var payload = newChild._payload;
            var init = newChild._init;
            return updateFromMap(existingChildren, returnFiber, newIdx, init(payload), lanes);
        }

        if (isArray(newChild) || getIteratorFn(newChild)) {
          var _matchedFiber3 = existingChildren.get(newIdx) || null;

          return updateFragment(returnFiber, _matchedFiber3, newChild, lanes, null);
        }

        throwOnInvalidObjectType(returnFiber, newChild);
      }

      {
        if (typeof newChild === 'function') {
          warnOnFunctionType(returnFiber);
        }
      }

      return null;
    }
    /**
     * Warns if there is a duplicate or missing key
     */