Function copyWithSetImpl

docs/external/js/react-dom.development.js:24611–24621

(obj, path, idx, value)

  {
    var copyWithSetImpl = function (obj, path, idx, value) {
      if (idx >= path.length) {
        return value;
      }

      var key = path[idx];
      var updated = Array.isArray(obj) ? obj.slice() : _assign({}, obj); // $FlowFixMe number or string is fine here

      updated[key] = copyWithSetImpl(obj[key], path, idx + 1, value);
      return updated;
    };

    var copyWithSet = function (obj, path, value) {
      return copyWithSetImpl(obj, path, 0, value);