JSPM

shortcut methods for util.isNullOrUndefined

A robust micro library for type checking. Defers to constructs' internal `[[Class]]` property rather than duck typing for excellent type detection and to avoid triggering false positives.

2 functions that check if argument is undefined or null

Finds the absolute filepath to the original sourcecode of any defined value

Object.assign that skips any undefined properties from source objects

Clone of PHP's function 'defined'

An object that will throw an exception if a user tries to access an undefined property

returns true if its argument is neither null nor undefined.

Safe chaining of object properties and functions using ES2015 Proxy.

Returns a new object without undefined object properties

A simple plugin to test the network speed between user device and a server sepcified by the user by downloading the file specified by the user

Check if an identifier is defined

definemodule6

A robust micro library for type checking. Defers to constructs' internal `[[Class]]` property rather than duck typing for excellent type detection and to avoid triggering false positives.

A logic Utility. Nil is: null or undefined. Make writing node easier, prettier and less error prone. Writes and reads more like prose

simple function to check if given object is defined and not null, or return optional parameter if its not

check if javascript properties are defined (with typescript support)

Return the first defined item in an array

A minimalistic boilerplate to wait for Custom Elements, or libraries, definition

A utility function for extracting defined values from an object.

checks if foo is not defined, i.e. undefined, null, an empty string, array, object or NaN

A TypeScript Type-Guard for Filtering out undefined Values

A few handy javascript utilities for testing variables