JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min.js"></script>

JavaScript

var playerResults = [{
    name: "blah",
    bracket: "one"
}, {
    name: "blah2",
    bracket: "three"
}, {
    name: "blah3",
    bracket: "two"
}, {
    name: "blah4",
    bracket: "one"
}];
var bracketOne = _.filter(playerResults, function (o) {
    return o.bracket == "one";
});
alert(JSON.stringify(bracketOne));