正则替换

RegExp 对象

参考：

工具：

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 parenthese!

答案：

const createPhoneNumber = n => n.join('').replace(/(\d{3})(\d{3})(\d{3})/,'($1) $2-$3');