locutus/golang/filepath/Base.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Base = Base;
function Base(path) {
    //      discuss at: https://locutus.io/golang/filepath/Base
    // parity verified: Go 1.23
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Mirrors path/filepath.Base for slash-separated paths on the Go parity target.
    //       example 1: Base('/a/b/c.txt')
    //       returns 1: 'c.txt'
    //       example 2: Base('/a/b/')
    //       returns 2: 'b'
    //       example 3: Base('')
    //       returns 3: '.'
    //       example 4: Base('////')
    //       returns 4: '/'
    const raw = String(path);
    if (raw === '') {
        return '.';
    }
    let end = raw.length;
    while (end > 0 && raw[end - 1] === '/') {
        end -= 1;
    }
    if (end === 0) {
        return '/';
    }
    const trimmed = raw.slice(0, end);
    const slash = trimmed.lastIndexOf('/');
    if (slash < 0) {
        return trimmed;
    }
    return trimmed.slice(slash + 1);
}