tarsana / functional

 * @param  array $list

 * @return array

 */

function takeWhile() {

    static $takeWhile = false;

    $takeWhile = $takeWhile ?: curry(function($predicate, $list) {

        $first = head($list);

        return (null == $first || !$predicate($first))

            ? []

            : prepend($first, takeWhile($predicate, tail($list)));

    });

    return _apply($takeWhile, func_get_args());

}

/**

 * Same as `takeWhile` but taking elements from the end of the array.

 * @param  array $list

 * @return array

 */

function takeLastWhile() {

    static $takeLastWhile = false;

    $takeLastWhile = $takeLastWhile ?: curry(function($predicate, $list) {

        $last = last($list);

        return (null == $last || !$predicate($last))

            ? []

            : append($last, takeLastWhile($predicate, init($list)));

    });

    return _apply($takeLastWhile, func_get_args());

}

/**

 * Takes elements from an array **until** the predicate