is-primitive

What is is-primitive?

The is-primitive npm package is used to check if a given value is a JavaScript primitive. A primitive in JavaScript is data that is not an object and has no methods. In JavaScript, there are 7 primitive data types: string, number, bigint, boolean, undefined, symbol, and null. This package provides a simple and straightforward way to determine if a value belongs to one of these types.

What are is-primitive's main functionalities?

Check if a value is a primitive

This feature allows you to check if a value is a primitive type. The function returns true for primitive values and false for objects (including arrays and functions).

const isPrimitive = require('is-primitive');

console.log(isPrimitive(42)); // true
console.log(isPrimitive('hello')); // true
console.log(isPrimitive(false)); // true
console.log(isPrimitive({})); // false
console.log(isPrimitive([])); // false
console.log(isPrimitive(function() {})); // false

Other packages similar to is-primitive

is

The 'is' package provides a comprehensive set of type-check functions, including checks for primitives. It offers more functionality than is-primitive by including type checks for objects, arrays, regexes, functions, and more.

type-check

The 'type-check' package allows you to check the types of JavaScript values with an extended type syntax. It is more complex and feature-rich compared to is-primitive, as it supports custom type definitions and more intricate type checking.

is-type-of

The 'is-type-of' package has a similar purpose to is-primitive but includes additional checks for specific JavaScript types and structures, such as streams, buffers, and errors, making it more versatile for certain applications.

README

is-primitive

Returns true if the value is a primitive.

Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.

Install

Install with npm:

$ npm install --save is-primitive

Primitive values

The Mozilla docs for "Primitive values" defines specifies six data types that are primitives:

• Boolean
• Null
• Undefined
• Number
• String
• Symbol (new in ECMAScript 6)

Usage

var isPrimitive = require('is-primitive');

true

All of the following return true:

console.log(isPrimitive(false));
console.log(isPrimitive(true));
console.log(isPrimitive(null));
console.log(isPrimitive());
console.log(isPrimitive(42));
console.log(isPrimitive('abc'));
console.log(isPrimitive(Symbol()));
//=> true

false

Everything else returns false:

console.log(isPrimitive({}));
console.log(isPrimitive([]));
console.log(isPrimitive(function(){}));
console.log(isPrimitive(new Date()));
// et cetera...
//=> false

About

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Running Tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

$ npm install && npm test

Building docs

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Related projects

You might also be interested in these projects:

• is-number: Returns true if the value is a number. comprehensive tests. | homepage
• is-plain-object: Returns true if an object was created by the Object constructor. | homepage
• kind-of: Get the native type of a value. | homepage

Contributors

Commits	Contributor
11	jonschlinkert
1	ljharb
1	bttmly
1	hemanth

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright © 2017, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.6.0, on November 23, 2017.