# Checklist of Fix Bug

**Published by:** [Dantc](https://paragraph.com/@dantc/)
**Published on:** 2022-07-06
**URL:** https://paragraph.com/@dantc/checklist-of-fix-bug

## Content

if the expression or variable is null, it’s still work;check the variable’s type and caller function belong to the varable;if you are not understand the original code immediately, but you understand after your deep thinking, write comment about it;incomming params check;return value maybe default value or just null, especially return empty object.

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