function get(key) {
        var state = getInternalState(this);
        if (isObject(key)) {
          var data = getWeakData(key);
          if (data === true) return uncaughtFrozenStore(state).get(key);
          return data ? data[state.id] : undefined;
        }
      }
function get(key) {
        var state = getInternalState(this);
        if (isObject(key)) {
          var data = getWeakData(key);
          if (data === true) return uncaughtFrozenStore(state).get(key);
          return data ? data[state.id] : undefined;
        }
      }
function get ( key ) { var state = getInternalState ( this ) ; if ( isObject ( key ) ) { var data = getWeakData ( key ) ; if ( data === true ) return uncaughtFrozenStore ( state ) . get ( key ) ; return data ? data [ state . id ] : undefined ; } }
23.3.3.3 WeakMap.prototype.get(key)
23 . 3 . 3 . 3 WeakMap . prototype . get ( key )
Get the value of a key.