02 - Test if a Variable or Function is Defined - Quality Assurance with Chai - freeCodeCamp Tutorial

How I like to think of undefined : Defined - Either exists and means something or does not exist (defined to mean null or nothing) Undefined - Exists but does not mean something

We can use the assert methods isDefined() and isUndefined() to check if a given value is 'defined' or not.

Link to Challenge : https://www.freecodecamp.org/learn/quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined Written Guide: https://www.notion.so/ganeshh123/Test-if-a-Variable-or-Function-is-Defined-557d228fbda74562bc27565d0e75d172

Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1SVteCORbgwlxJkAbcTiZyj All Writen Guides for this course : https://www.notion.so/ganeshh123/54ecbf7833414db885eec37f580599b4 All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26

0:00 - Concepts: 0:05 - What does 'defined' mean? 0:28 - Difference between undefined and null

01:14 - assert.isDefined() Asserts that value is not undefined. https://www.chaijs.com/api/assert/#method_isdefined

03:24 - assert.isUndefined() Asserts that value is undefined. https://www.chaijs.com/api/assert/#method_isundefined

04:54 - Challenge Solution -————————————————————————————————————- Chai is an assertion library, similar to Node's built-in assert. It makes testing much easier by giving you lots of assertions you can run against your code.

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