Test case details

Preparation Code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> <p id="foo">Foo</p> <p id="bar">Bar</p> <p id="baz">Baz</p>
var idSelectorRegexp = /^#[a-zA-Z]+[a-zA-Z0-9_\-]*$/;         var select = function(query){       // pure ID selector?       if (idSelectorRegexp.test(query))         return document.getElementById(query.slice(1));       else         return document.querySelector(query);     };

Test cases

Test #1

var bar = document.getElementById("bar");

Test #2

var bar = document.querySelector("#bar");

Test #3

var bar = select("#bar");

Test #4

var bar = $("#bar");