How to use

_isArray

function

in

lodash

describe('getSocketInfo', () => {
  it('returns an array of objects reporting number of data channels per socket', () => {
   m = new WS2Manager()

   m._sockets.push({
    pendingSubscriptions: [[], [], []],
    pendingUnsubscriptions: [[]],
    ws: { getDataChannelCount: () => 2 }
   })

   m._sockets.push({
    pendingSubscriptions: [[], [], []],
    pendingUnsubscriptions: [[]],
    ws: { getDataChannelCount: () => 3 }
   })

   const info = m.getSocketInfo()

   assert.ok(_isArray(info), 'did not return array')
   info.forEach(i => assert.ok(_isObject(i), 'socket info not an object'))
   assert.strictEqual(info[0].nChannels, 4, 'socket info does not report correct number of channels')
   assert.strictEqual(info[1].nChannels, 5, 'socket info does not report correct number of channels')
  })
 })

if (!_isArray(msg)) return // only array messages have sequence #s

const trades = M.unserialize(data)
if (_isArray(trades) && trades.length === 1) {
 data = trades[0]
} else {