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Niuke JS2 file extension

2022-07-02 17:23:00 【Drowned fish u】

Title Description
Please complete it JavaScript Code , The file name extension is required to be returned as a string , The file name parameter is "filename".

Answer key ：split(‘,’) Split string , Returns a split string array .reverse() Inverted array , Spell it ‘.’ return .

<html lang="en">
    <head>
        <meta charset="UTF-8">
    </head>
    <body>
        
        <script> const _getExFilename = (filename) => {
       //  The completion code  let arr = filename.split('.') arr.reverse() return '.' + arr[0] } </script>
    </body>
</html>