Function ref

lib/assets/react-source/development/react.js:17063–17076

(value)

	      }

	      var ref = function (value) {
	        var refs = inst.refs;

	        if (refs === emptyRefsObject) {
	          // This is a lazy pooled frozen object, so we need to initialize.
	          refs = inst.refs = {};
	        }

	        if (value === null) {
	          delete refs[stringRef];
	        } else {
	          refs[stringRef] = value;
	        }
	      };

	      ref._stringRef = stringRef;
	      return ref;