typeis-package
v1.0.1
Published
returns the type of what ever variable is passed in lowercase letters
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Readme
typeis-package
typeis-package
is a handy npm package that returns the type of the variable passed to it. It's designed to handle most variable types, including custom ones. If nothing is passed, it will return undefined
.
Installation
You can install the package using npm:
```bash npm i typeis-package ```
Usage
Import typeIs
from typeis-package
, and you can use it to determine the type of most variables.
```javascript import typeIs from 'typeis-package';
const result = typeIs('Hello, World!'); // returns 'string' ```
Code
Here's the core code of the package:
```javascript const typeIs = (input) => { if (input === null) return "null"; if (typeof input !== "object") { return typeof input; } let type = (input?.constructor?.name).toLowerCase(); return type ?? new Error("unknownType"); };
export default typeIs; ```
Special Cases
Custom Objects
If a custom object is passed, the type that will be returned is its name in lowercase.
Promises
If a promise is abstracted under another name, the package may fail to identify it a promise and return it as the name of it's constructor.
Typed Arrays
The code doesn't specifically handle typed arrays like Int8Array
, Uint8Array
, etc., so it will return their constructor names in lowercase.
Global Object
The code will return "object" for the global object (e.g., window
in browsers), which might be what you want, but it's worth being aware of.
Examples
```javascript import typeIs from 'typeis-package';
console.log(typeIs(null)); // returns 'null' console.log(typeIs(42)); // returns 'number' console.log(typeIs(new Int8Array())); // returns 'int8array' ```
Conclusion
typeis-package
is a versatile tool for identifying variable types in JavaScript. It's simple to use and covers a wide range of use cases. Be mindful of the special cases mentioned above to get the most out of this package.
Feel free to contribute, report issues, or suggest improvements on the GitHub repository.