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Used to check if some of the arguments are null or undefined.
checks if foo is not defined, i.e. undefined, null, an empty string, array, object or NaN
A utility function to validate if a value is undefined
Tools for testing against null and undefined values.
A small project my girlfriend and I have been working on.
A TypeScript Type-Guard for Filtering out undefined Values
Returns whether or not the passed arguments are defined - ie. not undefined
Utilities to determine if string is any of the following null, empty, undefined, NaN, or whitespace.
A meteor framework item
nuller is a small and simple library for providing default values for null or undefined object property access
A shorthand helper function for the pattern: const x = (typeof y !== 'undefined' ? y : 'default-value');
To check if the input is null, undefined, empty string, empty array, or an empty object
define string literal type
A meteor framework item
Escape the dreaded Uncaught TypeError: Cannot read property 'a' of undefined
Maybe function wrapper
Guard against null and undefined values
An error to throw when undefined value is passed.
The package provides methods to check whether a JSON object or a JSON array is empty or not. - The package considers an **object** empty when it is `null`, `undefined` or has no keys. - The package considers an **array** empty when it is `null`, `undefine
A utility function to validate if a value is null or undefined