JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://github.com/jquery/qunit/raw/master/qunit/qunit.css">
<h1 id="qunit-header">QUnit Test Suite</h1>
<h2 id="qunit-banner"></h2>
<div id="qunit-testrunner-toolbar"></div>
<h2 id="qunit-userAgent"></h2>
<ol id="qunit-tests"></ol>

JavaScript

var cutOutZero = function(value) {
    if (value.length && value.length > 0 && value[0] === '0') {
        return value.substring(1);
    }

    return value;
};

test("same if first character isn't 0", function() {
    equal('blah', cutOutZero('blah'));
});

test("one less if first character is 0", function() {
    equal('blah', cutOutZero('0blah'));
});