halfpastfouram/collection

<?php

namespace Halfpastfour\Collection\Collection;

/**
 * Interface MutableInterface
 */
interface MutableInterface extends ImmutableInterface
{
    /**
     * @param mixed $value
     *
     * @return $this
     */
    public function append( $value );

    /**
     * @param mixed $value
     *
     * @return $this
     */
    public function prepend( $value );

    /**
     * Shift an element off of the left of the collection.
     *
     * @return mixed
     */
    public function trimLeft();

    /**
     * Pop an element off of the right of the collection.
     *
     * @return mixed
     */
    public function trimRight();
}