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)
Why 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 isEmpty, isEmptyObject and isPlainObject are darn useful!
require('typechecker')npm install --save typecheckerrequire('typechecker')npm install --save typechecker//wzrd.in/bundle/typechecker@2.1.0require('typechecker')ender add typecheckerrequire('typechecker').isRegExp(/^a/) // returns true
Helpers:
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"Values:
isPlainObject - returns true if the value doesn't have a custom prototypeisEmpty - returns true if the value is null or undefinedisEmptyObject - returns true if the object has no keys that are its ownTypes:
isError - returns true if the value is an error, otherwise falseisDate - returns true if the value is a date, otherwise falseisArguments - returns true if the value is function arguments, otherwise falseisFunction - returns true if the value is a function, otherwise falseisRegExp - returns true if the value is a regular expression instance, otherwise falseisArray - returns true if the value is an array, otherwise falseisNumber - returns true if the value is a number ("2" is a string), otherwise falseisString - returns true if the value is a string, otherwise falseisBoolean - returns true if the value is a boolean, otherwise falseisNull - returns true if the value is null, otherwise falseisUndefined - returns true if the value is undefined, otherwise falseDiscover 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.
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v2.1.0 2015 August 26
isEmpty - it use to return the opposite of what was emptyFAQs
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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