flw.js
function _flw_store(key, cb) {
      const self = this;

      const fn = function (err, data) {
        if (err) return cb(err);

        self[key] = data;
        return cb();
      };
      return fn;
    }
function _flw_store(key, cb) {
      const self = this;

      const fn = function (err, data) {
        if (err) return cb(err);

        self[key] = data;
        return cb();
      };
      return fn;
    }
function _flw_store ( key , cb ) { const self = this ; const fn = function ( err , data ) { if ( err ) return cb ( err ) ; self [ key ] = data ; return cb ( ) ; } ; return fn ; }
Stores the data returned from the callback in the context with key 'key' then calls the callback
Stores the data returned from the callback in the context with key key then calls the callback