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typechecker
Advanced tools
Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)
Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)
require('typechecker')
npm install --save typechecker
require('typechecker')
ender add typechecker
require('typechecker').isRegExp(/^a/) // returns true
getObjectType
- returns the object string of the value, e.g. when passed /^a/
it'll return "[object RegExp]"
getType
- returns lower case string of the type, e.g. when passed /^a/
it'll return "regex"
isPlainObject
- returns true
if the value doesn't have a custom prototypeisError
- returns true
if the value an error, otherwise false
isDate
- returns true
if the value is a date, otherwise false
isArguments
- returns true
if the value is function arguments, otherwise false
isFunction
- returns true
if the value is a function, otherwise false
isRegExp
- returns true
if the value is a regular expression instance, otherwise false
isArray
- returns true
if the value is an array, otherwise false
isNumber
- returns true
if the value is a number ("2"
is a string), otherwise false
isString
- returns true
if the value is a string, otherwise false
isBoolean
- returns true
if the value is a boolean, otherwise false
isNull
- returns true
if the value is null, otherwise false
isUndefined
- returns true
if the value is undefined, otherwise false
isEmpty
- returns true
if the value is null
or undefined
isEmptyObject
- returns true
if the object has no keys that are its ownWhy should I use this instead of say instanceof
? Under certain circumstances instanceof
may not return the correct results.
This occurs with node's vm module especially, and circumstances where an object's prototype has been dereferenced from the original.
As such, for basic ==
and ===
checks (like a === null
), you're fine not using this, but for checks when you would have done instanceof
(like err instanceof Error
), you should try to use this instead.
Plus things like isEmptyObject
and isPlainObject
are darn useful!
Discover the change history by heading on over to the History.md
file.
Discover how you can contribute by heading on over to the Contributing.md
file.
These amazing people are maintaining this project:
No sponsors yet! Will you be the first?
These amazing people have contributed code to this project:
Licensed under the incredibly permissive MIT license
Copyright © 2013+ Bevry Pty Ltd us@bevry.me (http://bevry.me)
Copyright © 2011-2012 Benjamin Lupton b@lupton.cc (http://balupton.com)
v2.0.8 2013 November 1
FAQs
Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)
The npm package typechecker receives a total of 219,836 weekly downloads. As such, typechecker popularity was classified as popular.
We found that typechecker demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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