JSFiddle - React, Tailwind, and code Playground

HTML

<div id="input">
     <h1>Input</h1>

</div>
<div id="output">
     <h1>Becomes</h1>

</div>

JavaScript

// Take the following string
var string = "spanner, span, spaniel, span";
var arr = string.split(", ");
var unique = [];
$.each(arr, function (index,word) {
    if ($.inArray(word, unique) === -1) 
        unique.push(word);

});

alert(unique);