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JavaScript Package for checking is variable empty,undefined or null
Formerly rhumsaa/uuid. A PHP 5.4+ library for generating RFC 4122 version 1, 3, 4, and 5 universally unique identifiers (UUID).
An exception class to throw undefined error.
Checking how undefined string and number variables handles truthiness
An exception to throw when a Pigalle plugin is undefined.
Use hasNil to traverse chained object properties and check for null or undefined values.
Difference between null and undefined