It's possible without jQuery too! :)
let countries = ['United States', 'Canada', 'Argentina', 'Armenia', 'Aruba'];_x000D_
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// The <ul> that we will add <li> elements to:_x000D_
let myList = document.querySelector('ul.mylist');_x000D_
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// Loop over the Array of country names:_x000D_
countries.forEach(function(value, index, array) {_x000D_
// Create an <li> element:_x000D_
let li = document.createElement('li');_x000D_
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// Give it the desired classes & attributes:_x000D_
li.classList.add('ui-menu-item');_x000D_
li.setAttribute('role', 'menuitem');_x000D_
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// Now create an <a> element:_x000D_
let a = document.createElement('a');_x000D_
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// Give it the desired classes & attributes:_x000D_
a.classList.add('ui-all');_x000D_
a.tabIndex = -1;_x000D_
a.innerText = value; // <--- the country name from our Array_x000D_
a.href = "#"_x000D_
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// Now add the <a> to the <li>, and add the <li> to the <ul>_x000D_
li.appendChild(a);_x000D_
myList.appendChild(li);_x000D_
});
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<ul class="mylist"></ul>
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