JSFiddle - React, Tailwind, and code Playground

HTML

<pre id="text"></pre>

JavaScript

function search(m, x) {
    for (var i = 0; i < m.length; i++) {
        for (var j = 0; j < m[i].length; j++) {
            if (m[i][j] == x) {
                return [i, j];
            }
        }
    }
    return false;
}

var a = [
    [0, 11],
    [22, 33],
    [44, 55]
];
var output = "";
output += search(a, 0) + "\n";
output += search(a, 22) + "\n";
output += search(a, 55) + "\n";
output += search(a, 66) + "\n";
output += search(a, "hello") + "\n";
$("#text").html(output);