Function updateFromMap

lib/assets/react-source/development/react.js:17418–17463

(existingChildren, returnFiber, newIdx, newChild, expirationTime)

	  }

	  function updateFromMap(existingChildren, returnFiber, newIdx, newChild, expirationTime) {
	    if (typeof newChild === 'string' || 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, expirationTime);
	    }

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

	            if (newChild.type === REACT_FRAGMENT_TYPE) {
	              return updateFragment(returnFiber, _matchedFiber, newChild.props.children, expirationTime, newChild.key);
	            }

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

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

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

	      if (isArray$1(newChild) || getIteratorFn(newChild)) {
	        var _matchedFiber3 = existingChildren.get(newIdx) || null;

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

	      throwOnInvalidObjectType(returnFiber, newChild);
	    }

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

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