#javascript

批量分组

const largeRecipientList = new Array(2000).fill().map((_, idx) => `customer${idx}@nowhere.com`)
  // largeRecipientList is an array of email addresses
  const recipientLimit = 100
  const batches = largeRecipientList.reduce((batches, r) => {
    const lastBatch = batches[batches.length - 1]
    if(lastBatch.length < recipientLimit)
      lastBatch.push(r)
    else
      batches.push([r])
    return batches
  }, [[]])