A Deep Dive Into the Universal DataType Detector

How to Solve This: A Step-by-Step Guide

Step 1: Summon the Power of Object.prototype.toString

First, we call upon Object.prototype.toString.call(data). This incantation returns a raw string that holds clues about the data type.

Step 2: String Alchemy

Our next mission is to mine the useful nuggets—our data type—from this raw string.

The Code That Makes It All Happen

Behold the code that brings these steps to life.

1function detectType(data) {
2  const rawType = Object.prototype.toString.call(data);
3  return rawType.slice(8, -1).toLowerCase();
4}

The Under-the-Hood Mechanics

Our solution may look simple, yet it elegantly fulfills the requirement to be generic. We achieve this by invoking the Object.prototype.toString method, which acts like an oracle. The oracle speaks in riddles: it returns the data type enveloped in a string format like [object dataType].

Deciphering the Oracle's Message

The answer to our quest lies between the square brackets in the oracle's message. We slice this string to get that part. Then, to make it universally readable, we convert it to lowercase.

The Alternate Path

If you prefer another twist, you can modify the function to slice from the first character onward and then split the string using a space delimiter. This will still get you to the treasure—the data type.

1function detectType(data) {
2  return Object.prototype.toString
3    .call(data)
4    .slice(1, -1)
5    .split(" ")[1]
6    .toLowerCase();
7}

The Grand Conclusion

Now, you're equipped with a detectType function that's like a Swiss Army knife for data types. Not only does it elegantly solve the problem, but it also does so in a way that's adaptable to future challenges.