Semantic-UI Multiple selection get values

Suggesting that your code looks like this:

<div class="ui multiple selection dropdown">
    <i class="dropdown icon"></i>
    <div class="default text">Tag Multiple Categories</div>
        <select multiple="" id="multi-select">
            <option value="">Categories</option>
            <option value="datastructure">Data Structure</option>
            <option value="stack">Stack</option>
            <option value="queue">Queue</option>
        </select>
    </div> 
</div>

the following will return an array of selected values:

$("#multi-select").dropdown("get value") 

Output:

["stack", "queue"]

Note:

Make sure not to have hidden input field in the html otherwise it returns a string value instead of array of values