Trim the file extension from a file name

JavaScript

const trimExt = (fileName) => (fileName.indexOf('.') === -1 ? fileName : fileName.split('.').slice(0, -1).join('.'))

TypeScript

const trimExt = (fileName: string): string => (fileName.indexOf('.') === -1 ? fileName : fileName.split('.').slice(0, -1).join('.'))

Examples

trimExt('document') // document
trimExt('document.pdf') // document
trimExt('document.2020.pdf') // document.2020