kind-of
Advanced tools
Package description
The kind-of npm package is a utility library that allows developers to check the type of a given value in JavaScript. It provides a simple API to determine whether a value is a string, number, array, object, function, and other JavaScript types. This can be particularly useful for type checking and validation in applications where type safety is important.
Type checking for primitives
This feature allows you to check the type of primitive values such as numbers, strings, and booleans.
"use strict"; const kindOf = require('kind-of'); console.log(kindOf(1)); // 'number' console.log(kindOf('hello')); // 'string' console.log(kindOf(true)); // 'boolean'Type checking for objects
This feature allows you to check the type of object-based values such as plain objects, arrays, and regular expressions.
"use strict"; const kindOf = require('kind-of'); console.log(kindOf({})); // 'object' console.log(kindOf([])); // 'array' console.log(kindOf(/foo/)); // 'regexp'Type checking for functions and undefined
This feature allows you to check the type of functions and the undefined value.
"use strict"; const kindOf = require('kind-of'); console.log(kindOf(function () {})); // 'function' console.log(kindOf(undefined)); // 'undefined'Type checking for null and dates
This feature allows you to check the type of null values and date objects.
"use strict"; const kindOf = require('kind-of'); console.log(kindOf(null)); // 'null' console.log(kindOf(new Date())); // 'date'The 'type-check' package offers a similar functionality to 'kind-of' by allowing type assertions and checks. It provides a mini language to specify the types of values and can validate against those specifications.
The 'is' package is another utility library that provides type checking functions. It has a wider range of type checks available, including checks for specific JavaScript environments like the browser or Node.js.
The 'check-types' package provides a set of predicates for type checking. It has a fluent API and includes additional checks for min/max values, empty strings, and arrays, which are not directly available in 'kind-of'.
Changelog
[0.1.0] - 2014-9-26
Readme
Get the native type of a value.
npm i kind-of --save-dev
npm test
var kindOf = require('kind-of');
kindOf(undefined);
//=> 'undefined'
kindOf(null);
//=> 'null'
kindOf(true);
//=> 'boolean'
kindOf(false);
//=> 'boolean'
kindOf(new Boolean(true));
//=> 'boolean'
kindOf(42);
//=> 'number'
kindOf(new Number(42));
//=> 'number'
kindOf("string");
//=> 'string'
kindOf(arguments);
//=> 'arguments'
kindOf({});
//=> 'object'
kindOf(new Test());
//=> 'object'
kindOf(new Date());
//=> 'date'
kindOf([]);
//=> 'array'
kindOf([1, 2, 3]);
//=> 'array'
kindOf(new Array());
//=> 'array'
kindOf(/[\s\S]+/);
//=> 'regexp'
kindOf(new RegExp('^' + 'foo$'));
//=> 'regexp'
kindOf(function () {});
//=> 'function'
kindOf(new Function());
//=> 'function'
Jon Schlinkert
Copyright (c) 2014 Jon Schlinkert, contributors.
Released under the MIT license
This file was generated by verb-cli on September 26, 2014.
FAQs
Get the native type of a value.
We found that kind-of demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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