如何在JavaScript中使用正则表达式搜索键/值对？

Question

I have a JavaScript Object filled with key/value pairs and I would like to search one with a regex. Here's an example:

var map = {
    'my/route/one': 'Title1',
    'my/route/two': 'Title2',
    '/': 'Home'
}

And I would like something like this:

var myValue = searchByKey(map, 'my/route/two');

I did this at first:

searchByKey: function (map, routePattern) {
    var foundTitle,
        route;
    for (route in map) {
        if (routePattern.match(route)) {
            foundTitle = map[route];
            break;
        }
    }
    return foundTitle;
}

It worked, great. Then, I wanted to have something more functional, so I thought of this:

function searchByKey(map, routePattern) {
    var foundTitle;
    Object.keys(map).forEach(function(key) {
        if (routePattern.match(key)) {
            foundTitle = map[key];
        }
    });
    return foundTitle;
}

But it may match other keys like the last one '/' .

Do you have any idea on how achieve this in an elegant way?

Thanks!

Answer 1

You can simply do this!

 function searchByKey(map, route) { return map[route] ? map[route] : 'not found' //return 'not found' when an invalid key is given } var map = { 'my/route/one': 'Title1', 'my/route/two': 'Title2', '/': 'Home' } var myValue = searchByKey(map, 'my/route/two') console.log(myValue) 

Answer 2

Why not use the key directly?

 function searchByKey(object, key) { return object[key]; } var map = { 'my/route/one': 'Title1', 'my/route/two': 'Title2', '/': 'Home' } var myValue = searchByKey(map, 'my/route/two'); console.log(myValue); 

Another attempt with splitted keys

 function searchByKey(object, key) { var items = key.split('/'); return Object.keys(object).filter(function(k) { return items.every("".match.bind(k)); }); } var map = { 'my/route/one': 'Title1', 'my/route/two': 'Title2', '/': 'Home' }, myKeys = searchByKey(map, 'my/route/two'); console.log(myKeys);