JSFiddle - React, Tailwind, and code Playground

HTML

<div>foo bar</div>
<div>baz blah</div>
<div>lorem ipsum</div>

JavaScript

function collectionContains(collection, searchText) {
    for (var i = 0; i < collection.length; i++) {
        if( collection[i].innerText.toLowerCase().indexOf(searchText) > -1 ) {
            return true;
        }
    }
    return false;
}

var items = document.getElementsByTagName("div");
console.log( collectionContains(items, 'cant find') ); //returns false
console.log( collectionContains(items, 'baz') ); //returns true;