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codeql/javascript/ql/src/LanguageFeatures/UnusedIndexVariable.ql

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/**
* @name Unused index variable
* @description Iterating over an array but not using the index variable to access array elements
* may indicate a typo or logic error.
* @kind problem
* @problem.severity warning
* @id js/unused-index-variable
* @precision high
* @tags quality
* reliability
* correctness
*/
import javascript
import LanguageFeatures.UnusedIndexVariable
from RelationalComparison rel, Variable idx, Variable v
where unusedIndexVariable(rel, idx, v)
select rel, "Index variable " + idx + " is never used to access elements of " + v + "."