freeCodeCamp/guide/english/certifications/javascript-algorithms-and-d.../basic-javascript/understanding-uninitialized.../index.md

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2018-10-12 19:37:13 +00:00
---
title: Understanding Uninitialized Variables
---
## Understanding Uninitialized Variables
Make sure that the variable has the correct data value. Leaving a variable uninitialized, meaning you do not give it a value, can cause problems if you want to do operations on it.