Parsing a version number string to an associating value

Question

I'm attempting to parse a version string (examples below) in order to return a value depending on a key that matches the following rules listed below.

Each version ID can include a wildcard, however the input cannot. Ofcourse this object is dynamic and will most likely include more version matches.

In this example, the version string will be "1.2.3".

• Version IDs higher than 3.2.1 will return "null"
• Version IDs between 3.2.1 and 2.8.10 will return "testing_server"
• Version ID of 2.8.10 will return "second_value"
• Version IDs between 2.8.10 and 1.0.* will return "last value"
• Version IDs matching 1.0.* or less (including 0.*) will return "last value"

Example object:

{
   "3.2.1": "testing_server",
   "2.8.10": "second_value",
   "1.0.*": "last value"
}

I have tried several functions each including regex, or manual comparisons but haven't achieved much luck. I know its a bit of a tough one, but hopefully someone can help. :)

Answer 1

I ended up using "compare-versions" along with some logic to get it going.

const compareVersions = require('compare-versions');

function getVersion(version) {
    const versions = {
        "3.2.1": "testing_server",
        "2.8.10": "second_value",
        "1.0.*": "last value"
    }
    const sortedKeys = Object.keys(versions).sort(compareVersions);

    // not required
    //if (compareVersions(version, sortedKeys[sortedKeys.length - 1]) > 0) return null;

    let i = 0;
    while (i < sortedKeys.length && compareVersions(version, sortedKeys[i]) > 0) i++;
    return versions[sortedKeys[i]] || null;
}

const examples = [
    "3.2.2",
    "3.2.1",
    "2.8.11",
    "2.8.10",
    "1.1.0",
    "1.0",
    "0.0"
];

const answers = {};
for (const example of examples) {
    answers[example] = getVersion(example);
}
console.log(answers);