simplify-path.js

// Given an absolute path for a file (Unix-style), simplify it.
//
// For example,
// path = "/home/", => "/home"
// path = "/a/./b/../../c/", => "/c"
//
// Corner Cases:
//
//
// 	Did you consider the case where path = "/../"?
// 	In this case, you should return "/".
// 	Another corner case is the path might contain multiple slashes '/' together, such as "/home//foo/".
// 	In this case, you should ignore redundant slashes and return "/home/foo".
//
//


/**
 * @param {string} path
 * @return {string}
 */
var simplifyPath = function(path) {
    var pathArr = path.split('/'),
        stack = [],
        len = pathArr.length;
    
    for (var i = 0;i < len; ++i) {
        if (!pathArr[i] || pathArr[i] === '.') {
            continue;
        }
        if (pathArr[i] === '..') {
            if (stack.length) {
                stack.pop();
            }
        } else {
            stack.push(pathArr[i]);
        }
    }
    return '/' + stack.join('/');
};