How can I select using jQuery dropdown options that only contain a specific attribute?

I have a dropdown list where only some of the options have a certain attribute. For example

<select id="dropdown">
<option value="v1" data-otherattribute="12345">line 1</option>
<option value="v2" >line 2</option>
<option value="v3" data-otherattribute="67890">line 3</option>
<option value="v4" >line 4</option>
<option value="v5" data-otherattribute="234567">line 5</option>

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What is the jQuery to return just items v1, v3 and v5 - i.e. just the lines with the data-otherattribute setting?

For example, I think I could get them by searching by value like this
        var option = dropdown.find("option[value^='V1'],option[value^='V3'],option[value^='V5'])";

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but in reality I don't know what the values will be, I need to find just those with the attribute set. Also note the actual value of the attribute itself will change, so I can't search by that.
purplesoupProgrammerAsked:
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Julian HansenCommented:
You can use the hasattribute
https://api.jquery.com/has-attribute-selector/
var opts = $('#dropdown option[data-otherattribute]');

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purplesoupProgrammerAuthor Commented:
Thanks - I'm just leaving off, I'll give it a go tomorrow...
Julian HansenCommented:
Here is a sample that demonstrates the concept and how to access the elements.

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