jQuery version compatibility detection

Question

Are there any resources that can test a jQuery script/extension/plugin/whatever for version compatibility issues?

Answer 1

The code has some bugs, notably

1. $.isVersion('1.9.2.17', '<', '2.0') returns false
2. $.isVersion('1.17.2.1', '>', '1.8') returns false

Solution
1. is fixed by the attached code.
2. is not as it's trickier without a complete re-write, and is a rarer case anyway.

(function($) {
/**
 * Used for version test cases.
 *
 * @param {string} left A string containing the version that will become
 *        the left hand operand.
 * @param {string} oper The comparison operator to test against. By
 *        default, the "==" operator will be used.
 * @param {string} right A string containing the version that will
 *        become the right hand operand. By default, the current jQuery
 *        version will be used.
 *
 * @return {boolean} Returns the evaluation of the expression, either
 *         true or false.
 */
$.isVersion = function(left, oper, right) {
    if (left) {
        var pre = /pre/i,
            replace = /[^\d]+/g,
            oper = oper || "==",
            right = right || $().jquery,
            l = left.replace(replace, ''),
            r = right.replace(replace, ''),
            l_len = l.length, r_len = r.length,
            l_pre = pre.test(left), r_pre = pre.test(right);

        l = (r_len > l_len ? parseInt(l) * Math.pow(10, (r_len - l_len)) : parseInt(l));
        r = (l_len > r_len ? parseInt(r) * Math.pow(10, (l_len - r_len)) : parseInt(r));

        switch(oper) {
            case "==": {
                return (true === (l == r && (l_pre == r_pre)));
            }
            case ">=": {
                return (true === (l >= r && (!l_pre || l_pre == r_pre)));
            }
            case "<=": {
                return (true === (l <= r && (!r_pre || r_pre == l_pre)));
            }
            case ">": {
                return (true === (l > r || (l == r && r_pre)));
            }
            case "<": {
                return (true === (l < r || (l == r && l_pre)));
            }
        }
    }

    return false;
}
})(jQuery);