const path = require('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.
let 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('dirname(p):', path.dirname(p));
console.log('basename(p):', path.basename(p));

// We can check whether a path is absolute.
console.log(path.isAbsolute('dir/file'));
console.log(path.isAbsolute('/dir/file'));

let filename = 'config.json';

// Some file names have extensions following a dot.
// We can split the extension out of such names with extname.
let ext = path.extname(filename);
console.log(ext);

// To find the file's name with the extension removed,
// use path.basename with the extension as the 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.
let rel = path.relative('a/b', 'a/b/t/file');
console.log(rel);

rel = path.relative('a/b', 'a/c/t/file');
console.log(rel);