JavaScriptDataType

JavaScript - Array.Search

Javascript provides a Find method, also a toUpperCase method.

Javascript - searching an array for data.

The Array object as a method called toUpperCase()

Sample

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let checked = [];       // checked files

let topic = todo.pop();
console.log (`  Topic=${topic}`);

if (checked.find(topic.toUpperCase())) {
    console.log (`    Topic was already scanned`);
} else {
        
}

References