Function toFn

Sortable.js:976–994

(value, pull)

    },
    _prepareGroup = function _prepareGroup(options) {
      function toFn(value, pull) {
        return function (to, from, dragEl, evt) {
          var sameGroup = to.options.group.name && from.options.group.name && to.options.group.name === from.options.group.name;
          if (value == null && (pull || sameGroup)) {
            // Default pull value
            // Default pull and put value if same group
            return true;
          } else if (value == null || value === false) {
            return false;
          } else if (pull && value === 'clone') {
            return value;
          } else if (typeof value === 'function') {
            return toFn(value(to, from, dragEl, evt), pull)(to, from, dragEl, evt);
          } else {
            var otherGroup = (pull ? to : from).options.group.name;
            return value === true || typeof value === 'string' && value === otherGroup || value.join && value.indexOf(otherGroup) > -1;
          }
        };
      }
      var group = {};
      var originalGroup = options.group;
      if (!originalGroup || _typeof(originalGroup) != 'object') {