get file name without extension

trim.js

// https://stackoverflow.com/questions/4250364/how-to-trim-a-file-extension-from-a-string-in-javascript/34301737

// splite string into array by dot
// slice from the beginning to the second last to rid of the extension
// join the array and remain the dot within the name
filename.split('.').slice(0, -1).join('.')

// get file extension
filename.split('.').slice(-1).join()