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freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/understanding-uninitialized-variables/index.md
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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.