CODEWITHSUNDEEP
javascriptregexdictionarykeymatch
Barudar
Barudar

Reputation: 570

How to search a key/value pair with a regex in JavaScript?

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!

Upvotes: 1

Views: 3823

Answers (2)

Nina Scholz
Nina Scholz

Reputation: 386746

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);

Upvotes: 1

Pranesh Ravi
Pranesh Ravi

Reputation: 19133

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)

Upvotes: 2

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