getFileExtension method

String getFileExtension(
  1. String filePath
)

Extracts the file extension from a given file path.

filePath is the path of the file. Returns the file extension as a string.

Implementation

String getFileExtension(String filePath) {
  int lastDotIndex = filePath.lastIndexOf('.');
  if (lastDotIndex != -1 && lastDotIndex != 0) {
    return filePath.substring(lastDotIndex + 1);
  } else {
    return '';
  }
}