Title here
Summary here
File Paths in TypeScript
Here’s the translation of the Go code example to TypeScript, along with explanations in Markdown format suitable for Hugo:
The path module in Node.js provides functions to parse and construct file paths in a way that is portable between operating systems; dir/file on Linux vs. dir\file on Windows, for example.
import * as path from 'path';
// `join` should be used to construct paths in a
// portable way. It takes any number of arguments
// and constructs a hierarchical path from them.
const p = path.join('dir1', 'dir2', 'filename');
console.log('p:', p);
// You should always use `join` instead of
// concatenating `/`s or `\`s manually. In addition
// to providing portability, `join` will also
// normalize paths by removing superfluous separators
// and directory changes.
console.log(path.join('dir1//', 'filename'));
console.log(path.join('dir1/../dir1', 'filename'));
// `dirname` and `basename` can be used to split a path to the
// directory and the file. Alternatively, `parse` will
// return both in the same call.
console.log('Dir(p):', path.dirname(p));
console.log('Base(p):', path.basename(p));
// We can check whether a path is absolute.
console.log(path.isAbsolute('dir/file'));
console.log(path.isAbsolute('/dir/file'));
const filename = 'config.json';
// Some file names have extensions following a dot. We
// can split the extension out of such names with `extname`.
const ext = path.extname(filename);
console.log(ext);
// To find the file's name with the extension removed,
// use `basename` with a second argument.
console.log(path.basename(filename, ext));
// `relative` finds a relative path between a base and a
// target. It returns an error if the target cannot
// be made relative to base.
console.log(path.relative('a/b', 'a/b/t/file'));
console.log(path.relative('a/b', 'a/c/t/file'));To run the program:
$ ts-node file-paths.ts
p: dir1/dir2/filename
dir1/filename
dir1/filename
Dir(p): dir1/dir2
Base(p): filename
false
true
.json
config
t/file
../c/t/fileNote that in TypeScript (running on Node.js), we use the path module instead of filepath. The functions have slightly different names but similar functionality. For example, Join becomes join, Dir becomes dirname, Base becomes basename, Ext becomes extname, and Rel becomes relative.
Also, TypeScript doesn’t have a direct equivalent to Go’s error handling with multiple return values. In cases where error handling is needed, you would typically use try-catch blocks or work with Promises.