JavaScript Fun Question: Creating a Phone Number

Now provides an array containing 10 integers (0-9), requiring the return of a phone number string in the specified format.

Like this:

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

These numbers must be in the order they appear, and don’t forget the special symbols and spaces!

To be honest, when I saw this question for the first time, I was a little underestimated, and I quickly gave a popular solution.

Isn’t it just a matter of converting an array into a string, intercepting it, and then splicing it!

This phone number consists of three parts, the area code, the first half, and the second half:

function createPhoneNumber(numbers){  
    var areaCode = numbers.slice(0,3).join("");  
    var firstPart = numbers.slice(3,6).join("");  
    var secondPart = numbers.slice(6).join("");  
    return "(" + areaCode + ") " + firstPart + "-" + secondPart;  
}

This is the most direct method, but it is also the most versatile and scalable. solution.

What if the area code is 4 digits and the phone number is 8 digits? Wouldn't it require several changes?

The best is to give a general string template and give it according to the template.

Okay, now that you have thought of this step, let’s take a look at the writing method of an expert!

function createPhoneNumber(numbers){  
    var format = "(xxx) xxx-xxxx";  
    for(var i = 0; i < numbers.length; i++){  
        format = format.replace(&#39;x&#39;, numbers[i]);  
    }  
    return format;  
}

Well, that’s much better.

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