JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title></title>
</head>
<body>
</body>
</html>

JavaScript

var unique = function(origArr) {
    var newArr = [],
        origLen = origArr.length,
        found,
        x = 0; y = 0;
        
    for ( x = 0; x < origLen; x++ ) {
        found = undefined;
        for ( y = 0; y < newArr.length; y++ ) {
            if ( origArr[x] === newArr[y] ) found = true;
        }
        if ( !found) newArr.push( origArr[x] );    
    }
   return newArr;
}

var myarray = ['jeffrey', 'allie', 'patty', 'damon', 'zach', 'jeffrey', 'allie', 'patty', 'damon', 'zach', 'joe'];
myarray = unique(myarray);
alert(myarray.join(', '));