TYPO3.Fluid

This is a feature request. I first saw this functionality in smarty and I think you should insert this in fluid, too. You're right, when you told me to program this viewHelper on my own. But I think this should be in Core.

Here is my first try changing forViewHelper.php:

/**
 * Iterates through elements of $each and renders child nodes
 *
 * @param array $each The array or SplObjectStorage to iterated over
 * @param string $as The name of the iteration variable
 * @param string $key The name of the variable to store the current array key
 * @param boolean $reverse If enabled, the iterator will start with the last element and proceed reversely
 * @param integer $iterate If >= 0, you got a new element {iterate} which counts through the Arrays
 * @param integer $step If iterate is set, then you can set your prefered stepping 2 = 1,3,5,7,9
 * @return string Rendered string
 * @author Sebastian Kurfürst <sebastian@typo3.org>
 * @author Bastian Waidelich <bastian@typo3.org>
 * @author Robert Lemke <robert@typo3.org>
 * @api
     */
    public function render($each, $as, $key = '', $reverse = FALSE, $iterate = FALSE, $step = 1) {
        $output = '';
        if ($each === NULL) {
            return '';
        }
        if (is_object($each)) {
            if (!$each instanceof Traversable) {
                throw new Tx_Fluid_Core_ViewHelper_Exception('ForViewHelper only supports arrays and objects implementing Traversable interface' , 1248728393);
            }
            $each = $this->convertToArray($each);
        }

if ($reverse === TRUE) {
            $each = array_reverse($each);
        }

$output = '';
        foreach ($each as $keyValue => $singleElement) {
            $this->templateVariableContainer->add($as, $singleElement);
            if ($key !== '') {
                $this->templateVariableContainer->add($key, $keyValue);
            }
            if ($iterate !== FALSE) {
                $this->templateVariableContainer->add('iterate', $iterate);
                ($step != 1)? $iterate = $iterate + $step: $iterate++;
            }
            $output .= $this->renderChildren();
            $this->templateVariableContainer->remove($as);
            if ($key !== '') {
                $this->templateVariableContainer->remove($key);
            }
            if ($iterate !== FALSE) {
                $this->templateVariableContainer->remove('iterate');
            }
        }
        return $output;
    }

Now you can do something like this:
<f:for each="{customer.car}" as="car" iterate="2" step="2">
<tr>
<td>Auto {iterate}</td>
<td>{car.type}</td>
</tr>
</f:for>

and get:
Auto 1: BMW
Auto 3: Audi
Auto 5: VW

or remove step to get:
Auto 1: BMW
Auto 2: Audi
Auto 3: VW