Remove occurrences of duplicate words in a string

Question

Take the following string as an example:

var string = \"spanner, span, spaniel, span\";

From this string I would like to find the duplicate

Answer 1

// 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);

Live DEMO