jQuery AJAX smart retry

jQuery.ajaxRetry.js

// enhance the original "$.ajax" with a retry mechanism 
$.ajax = (($oldAjax) => {
    // on fail, retry by creating a new Ajax deferred
    function check(a,b,c){
        var shouldRetry = b != 'success' && b != 'parsererror';
        if( shouldRetry && --this.retries > 0 )
            setTimeout(() => { $.ajax(this) }, this.retryInterval || 100);
    }

    return settings => $oldAjax(settings).always(check)
})($.ajax);


// USAGE:
// now we can use the "retries" property if we need to retry on fail
$.ajax({
    type          : 'GET',
    url           : 'http://www.whatever123.gov',
    timeout       : 2000,
    retries       : 3,     //       <-------- Optional
    retryInterval : 2000   //       <-------- Optional
})
// Problem: "fail" will only be called once, and not for each retry
.fail(console.warn);