find the extension of a csv file in javascript

To find the extension of a csv file in JavaScript, you can use the built-in String.prototype methods to extract the substring from the file name. The extension can be found by taking the characters after the last dot in the file name.

Here's an example function that takes a file name as input and returns the file extension:

index.tsx
function getFileExtension(fileName) {
  return fileName.slice((fileName.lastIndexOf(".") - 1 >>> 0) + 2);
}
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To use this function on a csv file name, you would call it like this:

index.tsx
var fileName = "example.csv";
var extension = getFileExtension(fileName);
console.log(extension); // Output: "csv"
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This code will output the file extension as "csv".