JS promises will run parallelly or one by one

const startTime=Date.now()

const record1= new Promise((resolve,reject)=>{
  for(i=0;i<100;i++){
      for(j=0;j<100;j++){
          console.log(`${i}${j}`)
      }
  }
  resolve(Date.now()-startTime)
})

const record2= new Promise((resolve,reject)=>{
  for(k=0;k<100;k++){
      for(l=0;l<100;l++){
          console.log(`${k}${l}`)
      }
  }
  resolve(Date.now()-startTime)
})

const record3= new Promise((resolve,reject)=>{
  for(m=0;m<100;m++){
      for(n=0;n<100;n++){
          console.log(`${m}${n}`)
      }
  }
  resolve(Date.now()-startTime)
})
Promise.all([
  record1,
  record2,
  record3
]).then((msg)=>{
  console.log(msg)
})