function instanceSorter()

in app/scripts/modules/core/instance/instanceListBody.directive.js [96:149]
53 lines of code
30 McCabe index (conditional complexity)

        function instanceSorter(a1, b1) {
          let filterSplit = scope.sortFilter.instanceSort.key.split('-'),
              filterType = filterSplit.length === 1 ? filterSplit[0] : filterSplit[1],
              reverse = filterSplit.length === 2,
              a = reverse ? b1 : a1,
              b = reverse ? a1 : b1;

          switch(filterType) {
            case 'id':
              return a.id.localeCompare(b.id);
            case 'launchTime':
              return a.launchTime === b.launchTime ? a.id.localeCompare(b.id) : a.launchTime - b.launchTime;
            case 'availabilityZone':
              return a.availabilityZone === b.availabilityZone ?
                a.launchTime === b.launchTime ?
                  a.id.localeCompare(b.id) :
                a.launchTime - b.launchTime :
                a.availabilityZone.localeCompare(b.availabilityZone);
            case 'discoveryState':
              let aHealth = (a.health || []).filter((health) => health.type === 'Discovery'),
                  bHealth = (b.health || []).filter((health) => health.type === 'Discovery');
              if (aHealth.length && !bHealth.length) {
                return -1;
              }
              if (!aHealth.length && bHealth.length) {
                return 1;
              }
              return (!aHealth.length && !bHealth.length) || aHealth[0].state === bHealth[0].state ?
                a.launchTime === b.launchTime ?
                  a.id.localeCompare(b.id) :
                a.launchTime - b.launchTime :
                aHealth[0].state.localeCompare(bHealth[0].state);
            case 'loadBalancerSort':
              let aHealth2 = (a.health || []).filter((health) => health.type === 'LoadBalancer')
                    .sort((h1, h2) => h1.name.localeCompare(h2.name)),
                  bHealth2 = (b.health || []).filter((health) => health.type === 'LoadBalancer')
                    .sort((h1, h2) => h1.name.localeCompare(h2.name));
              if (aHealth2.length && !bHealth2.length) {
                return -1;
              }
              if (!aHealth2.length && bHealth2.length) {
                return 1;
              }
              let aHealthStr = aHealth2.map((h) => h.name + ':' + h.state).join(','),
                  bHealthStr = bHealth2.map((h) => h.name + ':' + h.state).join(',');
              return aHealthStr === bHealthStr ?
                a.launchTime === b.launchTime ?
                  a.id.localeCompare(b.id) :
                a.launchTime - b.launchTime :
                aHealthStr.localeCompare(bHealthStr);
            default:
              return -1;
          }
        }