Preparation code

<div id="result"></di>
<script>
  Benchmark.prototype.setup = function() {
    Number.prototype.toOrdinal1 = function () {
        
        var last = this.toString().substr( -1 );
        
        if( ['11','12','13'].indexOf( this.toString().substr( -2 ) ) > -1 ) {
            return this + 'th';
        } else if( last == '1' ) {
            return this + 'st';
        } else if( last == '2' ) {
            return this + 'nd';
        } else if( last == '3' ) {
            return this + 'rd';
        } else {
            return this + 'th';
        };
        
    };
    
    Number.prototype.toOrdinal2 = function () {
        
        if( [11,12,13].indexOf( this % 100 ) > -1 ) {
            return this + 'th';
        } else {
            return this + ['th','st','nd','rd','th','th','th','th','th','th'][this % 10];
        };
        
    };
    
    Number.prototype.toOrdinal3 = function()
    {
    var n = this % 100;
    var suff = ["th", "st", "nd", "rd", "th"]; // suff for suffix
    var ord= n<21?(n<4 ? suff[n]:suff[0]): (n%10>4 ? suff[0] : suff[n%10]);
    return this + ord;
    }
    
    var result = document.getElementById( 'result' );
    
  };
</script>

Preparation code output

Test runner

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result.innerHTML = (1234).toOrdinal1();
result.innerHTML = (1211).toOrdinal1();
result.innerHTML = (1200).toOrdinal1();
result.innerHTML = (1201).toOrdinal1();
result.innerHTML = (1202).toOrdinal1();
 

result.innerHTML = (1234).toOrdinal2();
result.innerHTML = (1211).toOrdinal2();
result.innerHTML = (1200).toOrdinal2();
result.innerHTML = (1201).toOrdinal2();
result.innerHTML = (1202).toOrdinal2();
 

result.innerHTML = (1234).toOrdinal3();
result.innerHTML = (1211).toOrdinal3();
result.innerHTML = (1200).toOrdinal3();
result.innerHTML = (1201).toOrdinal3();
result.innerHTML = (1202).toOrdinal3();
 

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