Good evening! Here's our prompt for today.

Detecting JavaScript Data Types: A Universal Method

The Challenge

Imagine a universe of data types in JavaScript! It's a colorful world with characters like Array, ArrayBuffer, Map, Set, Date, and the mysterious Function. Your mission, should you choose to accept it, is to create a universal method that identifies these inhabitants by their data type name.

Constraints:

• The function should take only one argument—the data object.
• We want a universal approach; using multiple if conditions to list and detect each data type is a no-go.

Example Usage

For the function detectType(), the following should hold true:

1detectType(1);           // Output: 'number'
2detectType(new Map());   // Output: 'map'
3detectType([]);          // Output: 'array'
4detectType(null);        // Output: 'null'

Try to solve this here or in Interactive Mode.

How do I practice this challenge?

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function detectType(data) {

  return Object.prototype.toString

    .call(data)

    .slice(1, -1)

    .split(" ")[1]

    .toLowerCase();

}

​

We'll now take you through what you need to know.

How do I use this guide?