JS, call in the for loop is asynchronously converted to synchronous execution

If for There are asynchronous methods in the loop , Will not wait for the asynchronous execution to complete , Just execute the following code , as follows ：

//callback => Promise
function get(element){
    
     // Impersonate asynchronous request 
     setTimeout(()=>{
    
        if(element==5){
    
            console.log(' error ')
            return ' error '
        }else{
    
            console.log(' correct ')
            return ' correct '
        }
    },100)
}

function down(){
    
    let array=[1,2,3,4,5,6]
    for (let index = 0; index < 5; index++) {
    
        const element = array[index];
        get(element)
    }
    console.log(' Cycle is completed ') 
}

down()
//  Cycle is completed 
//  correct 
//  correct 
//  correct 
//  correct 
//  error 

Suppose you want to wait for the asynchronous execution to complete before executing the following code , That is, asynchronous to synchronous , If it is to use callback Asynchronous implementation , Need to put callback convert to Promise, The code is as follows ：

function get(element){
    
    return new Promise((resolve,reject)=>{
    
        // Impersonate asynchronous request 
        setTimeout(()=>{
    
            if(element==5){
    
                reject(' error ')
            }else{
    
                resolve(' correct ')
            }
        },500)
    })
}

async function down(){
    
    let array=[1,2,3,4,5,6]
    for (let index = 0; index < 5; index++) {
    
        const element = array[index];
        try {
    
          let res = await get(element)
          console.log(res)
        } catch (error) {
    
            console.log(error)
            return
        }
    }
    console.log(' Cycle is completed ')
}

down()

//  correct 
//  correct 
//  correct 
//  correct 
//  error