Summary

NULL…

• subverts types
• is sloppy
• is a special case
• makes poor APIs
• exacerbates poor language decisions
• is difficult to debug
• is non-composable

See source https://www.lucidchart.com/techblog/2015/08/31/the-worst-mistake-of-computer-science/

Other Resources

• Why-null-is-bad - http://www.yegor256.com/2014/05/13/why-null-is-bad.html
• http://www.yegor256.com/2016/08/15/what-is-wrong-object-oriented-programming.html
• https://silkandspinach.net/2014/10/19/eliminate-many-conditionals-with-this-one-weird-trick/
• https://silkandspinach.net/2014/09/21/where-do-conditionals-come-from/