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: 4

function pow(x,n)
{
  let result=1;
  for(let i=0;i<n;i++) {result*=x;}
  return result;
}

let x=prompt("x?",''), n=prompt("n?",'')
if (n<=0)
{
  alert(`Power ${n} is not supported, please enter an integer number greater than zero`);
}
else
{
  alert(pow(x,n))
}

:

function pow(x,n)  // <- 
{  // <- 
  let result=1;   // <- = 
  for(let i=0;i<n;i++) {result*=x;}   // <- 
  // { ... } 
  return result;
}

let x=prompt("x?",''), n=prompt("n?",'') // <-- ,
// 2 ; 
if (n<0)  // <- (n < 0) 
{   // <- 
  //  -- 12
  alert(`Power ${n} is not supported, please enter an integer number greater than zero`);
}
else // <- "} else {" 1
{
  alert(pow(x,n))  // spaces  ; 
}

:

function pow(x, n) {
  let result = 1;

  for (let i = 0; i < n; i++) {
    result *= x;
  }

  return result;
}

let x = prompt("x?", "");
let n = prompt("n?", "");

if (n < 0) {
  alert(`Power ${n} is not supported,
    please enter an integer number greater than zero`);
} else {
  alert( pow(x, n) );
}

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