Undefined Packages

Better alternative for 'typeof' in JavaScript

A meteor framework item

Check whether the provided value is undefined.

Returns whether or not the passed arguments are defined - ie. not undefined

Throw TypeError if not a value is array-like. The undefined value always evaluates to true.

Determine if a value is `undefined`

It is an npm package to validate if the value is null, empty or undefined

magical convenience for checking if any datatype has a value, key, or data in the datatype, or the key. Handles null, undefined, NaN, and every other edge case. Where lodash is too afraid to go, ithas is to the rescue!

Check if the given value is of a specific type.

don't worry about get value from object/array

Check if value is defined

Validate the type of array's items.

Better error handling for undefined values in nested objects.

Check if value is undefined

Gracefully handle environment variables being undefined in Node.js applications

Filter null/undefined value.

Serializer is a superset of JSON that includes recursive objects, dates, regular expressions, functions and others which you also can expand by yourself

An error to throw when undefined value is passed.

A meteor framework item

A meteor framework item