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    <title>JS Bin</title>
  </head>
  <body>
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function printLetter(letter, callback) { //<- callback function param added
  setTimeout(() => {
    console.log(letter)
    callback() // <- execute (call) the callback param after printing letter
   }, Math.floor(Math.random() * 3000))
}
​
/*
Using nested callback structure
to control the execution order
of the async functions
*/
​
function printAll(){
  printLetter("A", () => {
    printLetter("B", () => {
      printLetter("C", () => {})
    })
  })
}
​
console.log('Calling printAll function')
printAll()
console.log('End of code')
Output

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