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function(e){function t(e){var r=this;if(r instanceof t||(r=new t),r.tail=null,r.head=null,r.length=0,e&&"function"==typeof e.forEach)e.forEach(function(e){r.push(e)});else if(arguments.length>0)for(var n=0,i=arguments.length;n<i;n++)r.push(arguments[n]);return r}function r(e,t,n,i){if(!(this instanceof r))return new r(e,t,n,i);this.list=i,this.value=e,t?(t.next=this,this.prev=t):this.prev=null,n?(n.prev=this,this.next=n):this.next=null}e.exports=t,t.Node=r,t.create=t,t.prototype.removeNode=function(e){if(e.list!==this)throw Error("removing node which does not belong to this list");var t=e.next,r=e.prev;t&&(t.prev=r),r&&(r.next=t),e===this.head&&(this.head=t),e===this.tail&&(this.tail=r),e.list.length--,e.next=null,e.prev=null,e.list=null},t.prototype.unshiftNode=function(e){if(e!==this.head){e.list&&e.list.removeNode(e);var t=this.head;e.list=this,e.next=t,t&&(t.prev=e),this.head=e,this.tail||(this.tail=e),this.length++}},t.prototype.pushNode=function(e){if(e!==this.tail){e.list&&e.list.removeNode(e);var t=this.tail;e.list=this,e.prev=t,t&&(t.next=e),this.tail=e,this.head||(this.head=e),this.length++}},t.prototype.push=function(){for(var e,t,n=0,i=arguments.length;n<i;n++){e=this,t=arguments[n],e.tail=new r(t,e.tail,null,e),e.head||(e.head=e.tail),e.length++}return this.length},t.prototype.unshift=function(){for(var e,t,n=0,i=arguments.length;n<i;n++){e=this,t=arguments[n],e.head=new r(t,null,e.head,e),e.tail||(e.tail=e.head),e.length++}return this.length},t.prototype.pop=function(){if(this.tail){var e=this.tail.value;return this.tail=this.tail.prev,this.tail?this.tail.next=null:this.head=null,this.length--,e}},t.prototype.shift=function(){if(this.head){var e=this.head.value;return this.head=this.head.next,this.head?this.head.prev=null:this.tail=null,this.length--,e}},t.prototype.forEach=function(e,t){t=t||this;for(var r=this.head,n=0;null!==r;n++)e.call(t,r.value,n,this),r=r.next},t.prototype.forEachReverse=function(e,t){t=t||this;for(var r=this.tail,n=this.length-1;null!==r;n--)e.call(t,r.value,n,this),r=r.prev},t.prototype.get=function(e){for(var t=0,r=this.head;null!==r&&t<e;t++)r=r.next;if(t===e&&null!==r)return r.value},t.prototype.getReverse=function(e){for(var t=0,r=this.tail;null!==r&&t<e;t++)r=r.prev;if(t===e&&null!==r)return r.value},t.prototype.map=function(e,r){r=r||this;for(var n=new t,i=this.head;null!==i;)n.push(e.call(r,i.value,this)),i=i.next;return n},t.prototype.mapReverse=function(e,r){r=r||this;for(var n=new t,i=this.tail;null!==i;)n.push(e.call(r,i.value,this)),i=i.prev;return n},t.prototype.reduce=function(e,t){var r,n=this.head;if(arguments.length>1)r=t;else if(this.head)n=this.head.next,r=this.head.value;else throw TypeError("Reduce of empty list with no initial value");for(var i=0;null!==n;i++)r=e(r,n.value,i),n=n.next;return r},t.prototype.reduceReverse=function(e,t){var r,n=this.tail;if(arguments.length>1)r=t;else if(this.tail)n=this.tail.prev,r=this.tail.value;else throw TypeError("Reduce of empty list with no initial value");for(var i=this.length-1;null!==n;i--)r=e(r,n.value,i),n=n.prev;return r},t.prototype.toArray=function(){for(var e=Array(this.length),t=0,r=this.head;null!==r;t++)e[t]=r.value,r=r.next;return e},t.prototype.toArrayReverse=function(){for(var e=Array(this.length),t=0,r=this.tail;null!==r;t++)e[t]=r.value,r=r.prev;return e},t.prototype.slice=function(e,r){(r=r||this.length)<0&&(r+=this.length),(e=e||0)<0&&(e+=this.length);var n=new t;if(r<e||r<0)return n;e<0&&(e=0),r>this.length&&(r=this.length);for(var i=0,o=this.head;null!==o&&i<e;i++)o=o.next;for(;null!==o&&i<r;i++,o=o.next)n.push(o.value);return n},t.prototype.sliceReverse=function(e,r){(r=r||this.length)<0&&(r+=this.length),(e=e||0)<0&&(e+=this.length);var n=new t;if(r<e||r<0)return n;e<0&&(e=0),r>this.length&&(r=this.length);for(var i=this.length,o=this.tail;null!==o&&i>r;i--)o=o.prev;for(;null!==o&&i>e;i--,o=o.prev)n.push(o.value);return n},t.prototype.reverse=function(){for(var e=this.head,t=this.tail,r=e;null!==r;r=r.prev){var n=r.prev;r.prev=r.next,r.next=n}return this.head=t,this.tail=e,this}}