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76 packages found
To check if the input is null, undefined, empty string, empty array, or an empty object
Returns true if a value exists, false if empty. Works with deeply nested values using object paths.
A simple package to check if input is null, undefined, or an empty string
Check if something exists (e.g. not null || undefined)
Check if the given value is of a specific type.
- check
- type
- typeof
- isArray
- isNumber
- isObject
- isNull
- isUndefined
- isNil
- isBoolean
- isString
- array
- number
- object
- View more
Check if `this` is truthy.
Check if a given value is empty in JS extending his "truthy" and "falsy" nature
Checks if the given value is a window object.
Test if a value is null.
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
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A small set of functions to check value against a specific type
- type
- check
- guard
- isNumber
- isArray
- isString
- checker
- isFinite
- undefined
- null
- primitive
- isFunction
- function
- isUndefined
exists and allExist functions. plain and simple
Used to check if some of the arguments are null or undefined.
Coalesce for JavaScript. Returns the first value that is not undefined or null.
Ensure a path doesn't contain null bytes
Check if a given object is null or empty
use hasNil to traverse chained object properties and check for null or undefined values
Returns true if the given is falsey (according to JavaScript) or matches a 'falsey' keyword.
Type safe variable checks
Allows parsing of an existential check in Babel