code: function registerConditionsToGroup(conditions) {
              for (let i = 0; i < conditions.length; ++i) {
                  const condition = conditions[i];
  
                  if (condition.group) {
                      let group = groupMap.get(condition.group);
  
                      if (!group) {
                          group = [];
                          groupMap.set(condition.group, group);
                      }
                      group.push(condition);
                  }
              }
          }
docs: Registers given conditions to the group the condition belongs to.
  
  @param {LoopConditionInfo[]} conditions - A loop condition info to
  register.
  @returns {void}