use arrow functions, fix binding issue. See #1114
use arrow functions, fix binding issue. See #1114

pprados/gekko,askmike/gekko,generalectric/gekko,BarnumD/gekko,generalectric/gekko,generalectric/gekko,nourchawich/gekko,BarnumD/gekko,nourchawich/gekko,pprados/gekko,askmike/gekko,BarnumD/gekko,pprados/gekko,nourchawich/gekko,askmike/gekko