Batch execution against a list of items with sleep interval

BatchQuery.js

class BatchQuery {

  constructor(connection, queryList, batchSize = 10, sleepMs = 1000) {
    this.connection = connection
    this.queryList = queryList
    this.batchSize = batchSize
    this.sleepMs = sleepMs
    this.queryResults = []
  }

  async singleQuery(q) {
    try {
      // Your query logic goes here
      // const result = await connection.post('/api/endpoint/', q)
      // return result
    } catch (error) {
      return Promise.reject(error)
    }
  }

  async execute() {

    let sleep = () => new Promise(resolve => setTimeout(resolve, this.sleepMs))

    const batchedList = this.queryList.reduce((temp, x, i) => {
      const subIndex = Math.floor(i / this.batchSize)
      if(!temp[subIndex])
        temp[subIndex] = []
      temp[subIndex].push(x)
      return temp
    }, [])

    for (const [index, batch] of batchedList.entries()) {
      this.queryResults.push(await Promise.allSettled(batch.map(q => this.singleQuery(q))))
      await sleep()
    }

  }

  get results() {
    return this.queryResults.flat()
  }

}

example.js

const queryAll = async (connection, someList) => {

  const batchQuery = new BatchQuery(connection, someList)
  await batchQuery.execute()
  return batchQuery.results
  
}