JSFiddle - React, Tailwind, and code Playground

HTML

<table>
  <tr class="al tv">
    <td>October 2</td>
    <td>12:30 pm</td>
    <td class="competition"></td>
    <td>Team A v Team B</td>
    <td class="field">1</td>
  </tr>
  <tr class="be tv">
    <td>October 2</td>
    <td>6 pm</td>
    <td class="competition"></td>
    <td>Team C v Team D</td>
    <td class="field">2</td>
  </tr>
  <tr class="ga tv">
    <td>October 3</td>
    <td>12:30 pm</td>
    <td class="competition"></td>
    <td>Team D v Team A</td>
    <td class="field">3</td>
  </tr>
  <tr class="de tv">
    <td>October 3</td>
    <td>6 pm</td>
    <td class="competition"></td>
    <td>Team C v Team B</td>
    <td class="field">4</td>
  </tr>
</table>

JavaScript

$(document).ready(function() {

      
      
var compClass = new Array();
compClass[0] = 'al',
compClass[1] = 'be',
compClass[2] = 'ga',
compClass[3] = 'de';
    
var competitions = new Array();
competitions[0] = 'alpha',
competitions[1] = 'beta',
competitions[2] = 'gamma',
competitions[3] = 'delta';
    
    
    $.map($("tr"), function(tr, i) {
        
        $.each(compClass, function(index, someClass){
            if ($(tr).hasClass(someClass)) {
                classIndex = compClass.indexOf(someClass);
                compVal = competitions[classIndex];
                $(tr).find(".competition").each(function() {this.innerHTML = compVal});
            };
        });
    });
});