npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

x-is-type

v1.2.9

Published

A minimal package for simple type-checks of basic types

Downloads

14

Readme

x-is-type

x-is-type is a minimal package for simple type-checks of basic types.

Package is bundled using microbundle

Installation

npm i x-is-type

In Node.js

// ESM:
import { isNum, isStr, isObj } from 'x-is-type';
// CommonJS:
const { isNum, isStr, isObj } = require('x-is-type');

Usage

This package includes the following functions for type checking of one or more variables.

/** Check if typeof value is 'number' and not NaN */
isNum(1);
// => true
isNum(NaN);
// => false

/**
 * Check if typeof value is 'number',
 * not NaN and integers
 */
isInt(1);
// => true
isInt(1.1);
// => false

/**
 * Check if typeof value is 'number',
 * not NaN and floating point numbers
 */
isFloat(1.1);
// => true
isFloat(1);
// => false

/** Check if typeof value is 'string' */
isStr('1');
// => true
isStr(1);
// => false

/** Check if typeof value is 'boolean' */
isBool(false);
// => true
isBool(null);
// => false

/**
 * Check if typeof value is 'object',
 * not null and instances of ObjectConstructor
 */
isObj({ foo: 'bar' });
// => true
isObj(null);
// => false

/** Check if value is an array, (uses Array.isArray) */
isArr([1, 2, 3]);
// => true
isArr({});
// => false

/** Check if typeof value is 'function' */
isFn(() => {});
// => true
isFn({});
// => false

/** Check if value is null */
isNull(null);
// => true
isNull(undefined);
// => false

/** Check if value is undefined */
isUndef(undefined);
// => true
isUndef(null);
// => false

/** Check if value is an instance of DateConstructor */
isDate(new Date());
// => true
isDate(Date.now());
// => false

/**
 * Check if value is an instance of DateConstructor
 * and contains valid dates
 */
isValidDate(new Date(1970, 1, 1));
// => true
isValidDate(new Date('hello'));
// => false

/** Check if typeof value is 'symbol' */
isSymbol(Symbol(123));
// => true
isSymbol(123);
// => false

/** Check if value is an instance of MapConstructor */
isMap(new Map());
// => true
isMap({ foo: 'bar' });
// => false

/** Check if value is an instance of SetConstructor */
isSet(new Set());
// => true
isSet(new Array());
// => false

/** Check if x is any non-falsy value */
isTruthy(1);
// => true
isTruthy(0);
// => false

/** Check if x is any falsy value */
isFalsy(0);
// => true
isFalsy(1);
// => false