codewars--js--create phone number

Write a function that accepts an array of 10 integers (between 0 and 9), that returns a string of those numbers in the form of a phone number.

Example:

createPhoneNumber([1, 2, 3, 4, 5, 6, 7, 8, 9, 0]) // => returns "(123) 456-7890"

The returned format must be correct in order to complete this challenge. 
Don't forget the space after the closing parentheses!

我的答案：

function createPhoneNumber(numbers){
  
  //var a="(".concat(numbers);
  //a=a.replace(/,/g,"");
  var a=numbers.slice(0,3);
  a="(".concat(a).concat(") ");
  var b=numbers.slice(3,6);
  b=b.concat("-");
  var c=numbers.slice(6);
  var d=a.concat(b).concat(c);
  d=d.replace(/,/g,"");
  return d; 
  
}

优秀答案：

function createPhoneNumber(numbers){
  var format = "(xxx) xxx-xxxx";
  
  for(var i = 0; i < numbers.length; i++)
  {
    format = format.replace('x', numbers[i]);
  }
  
  return format;
}

function createPhoneNumber(numbers){
  return numbers.join('').replace(/(...)(...)(.*)/, '($1) $2-$3');
}