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46 packages found
A utility to determine if a value is undefined
undefined is not a function and it's likely to remain so forever
Test if a value is undefined.
- stdlib
- stdassert
- assertion
- assert
- utilities
- utility
- utils
- util
- undefined
- void
- is
- isundefined
- isvoid
- type
- View more
Check whether a value is a `Generator` or `GeneratorFunction`. The `co` way, more strict checking. Always return boolean true or false, never null or undefined.
- check
- es2015
- es6
- es7
- function
- functions
- generator
- generatorfunction
- generators
- is
- is-function
- is-generator
- is-generator-function
- next
Used to check if some of the arguments are null or undefined.
A one-liner to check if a property is set (not null, undefined or empty string).
Check if a given object is null or empty
Test if a value is undefined or null.
- stdlib
- stdassert
- assertion
- assert
- utilities
- utility
- utils
- util
- undefined
- void
- null
- is
- isundefined
- isnull
- View more
Safe and simple PHP isset() for JavaScript
A utility to determine if a value is null or undefined
Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)
- array
- assert
- assertion
- async
- async function
- async-function
- asyncFunction
- bool
- boolean
- browser
- check
- check-type
- checking
- class
- View more
Fast cleaner is an npm module designed to clean javascript objects from unwanted values like `undefined`, `NaN`, `{}`(empty objects) .. etc.
- deterministic
- scheme
- own
- ArrayBuffer
- getter
- recursive
- eslintplugin
- banner
- debug
- stateless
- util
- browserlist
- queue
- password
- View more
When you need validate the variable data type
Test if a value is a JavaScript primitive.
- stdlib
- stdassert
- assertion
- assert
- utilities
- utility
- utils
- util
- valid
- primitive
- string
- number
- null
- undefined
- View more
Curried TypeScript type guards for primitive types and classes
- TypeScript
- type guards
- type
- guard
- isBoolean
- isNumber
- isString
- isSymbol
- isNull
- isUndefined
- isPrimitive
- isNonPrimitive
- is
- isLike
- View more
Removes empty _objects_, _arrays_, empty _strings_, _NaN_, _null_ and _undefined_ values from objects. Does not alter the original object.
- password
- debugger
- URLSearchParams
- cache
- columns
- rds
- sns
- resolve
- helpers
- ES2017
- mru
- trimRight
- escape
- negative zero
- View more
Checks if the given value is null or undefined
Aims to solve the problem of this error. When there is a complex object such us: