How to Extract File Extensions in JavaScript?

Extracting File Extensions in JavaScript

JavaScript lacks built-in functionality for retrieving file extensions, making it necessary to create a custom function. The provided code presents a solution that accurately extracts the extension for both file1 and file2.

Function Implementation:

The getFileExtension function accepts a filename as its argument and separates the extension using a period (.) as the delimiter. The final element of the resulting array is the file extension.

Revised Code:

The revised version of the code incorporating the suggested enhancements:

function getFileExtension(filename) {
  return (/[.]/.exec(filename)) ? /[^.]+$/.exec(filename) : undefined;
}

This version ensures that both files with and without extensions are handled correctly. If the filename does not contain a period, the function returns undefined.

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