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  "readme": "# yallist\n\nYet Another Linked List\n\nThere are many doubly-linked list implementations like it, but this\none is mine.\n\nFor when an array would be too big, and a Map can't be iterated in\nreverse order.\n\n\n[![Build Status](https://travis-ci.org/isaacs/yallist.svg?branch=master)](https://travis-ci.org/isaacs/yallist) [![Coverage Status](https://coveralls.io/repos/isaacs/yallist/badge.svg?service=github)](https://coveralls.io/github/isaacs/yallist)\n\n## basic usage\n\n```javascript\nvar yallist = require('yallist')\nvar myList = yallist.create([1, 2, 3])\nmyList.push('foo')\nmyList.unshift('bar')\n// of course pop() and shift() are there, too\nconsole.log(myList.toArray()) // ['bar', 1, 2, 3, 'foo']\nmyList.forEach(function (k) {\n  // walk the list head to tail\n})\nmyList.forEachReverse(function (k, index, list) {\n  // walk the list tail to head\n})\nvar myDoubledList = myList.map(function (k) {\n  return k + k\n})\n// now myDoubledList contains ['barbar', 2, 4, 6, 'foofoo']\n// mapReverse is also a thing\nvar myDoubledListReverse = myList.mapReverse(function (k) {\n  return k + k\n}) // ['foofoo', 6, 4, 2, 'barbar']\n\nvar reduced = myList.reduce(function (set, entry) {\n  set += entry\n  return set\n}, 'start')\nconsole.log(reduced) // 'startfoo123bar'\n```\n\n## api\n\nThe whole API is considered \"public\".\n\nFunctions with the same name as an Array method work more or less the\nsame way.\n\nThere's reverse versions of most things because that's the point.\n\n### Yallist\n\nDefault export, the class that holds and manages a list.\n\nCall it with either a forEach-able (like an array) or a set of\narguments, to initialize the list.\n\nThe Array-ish methods all act like you'd expect.  No magic length,\nthough, so if you change that it won't automatically prune or add\nempty spots.\n\n### Yallist.create(..)\n\nAlias for Yallist function.  Some people like factories.\n\n#### yallist.head\n\nThe first node in the list\n\n#### yallist.tail\n\nThe last node in the list\n\n#### yallist.length\n\nThe number of nodes in the list.  (Change this at your peril.  It is\nnot magic like Array length.)\n\n#### yallist.toArray()\n\nConvert the list to an array.\n\n#### yallist.forEach(fn, [thisp])\n\nCall a function on each item in the list.\n\n#### yallist.forEachReverse(fn, [thisp])\n\nCall a function on each item in the list, in reverse order.\n\n#### yallist.get(n)\n\nGet the data at position `n` in the list.  If you use this a lot,\nprobably better off just using an Array.\n\n#### yallist.getReverse(n)\n\nGet the data at position `n`, counting from the tail.\n\n#### yallist.map(fn, thisp)\n\nCreate a new Yallist with the result of calling the function on each\nitem.\n\n#### yallist.mapReverse(fn, thisp)\n\nSame as `map`, but in reverse.\n\n#### yallist.pop()\n\nGet the data from the list tail, and remove the tail from the list.\n\n#### yallist.push(item, ...)\n\nInsert one or more items to the tail of the list.\n\n#### yallist.reduce(fn, initialValue)\n\nLike Array.reduce.\n\n#### yallist.reduceReverse\n\nLike Array.reduce, but in reverse.\n\n#### yallist.reverse\n\nReverse the list in place.\n\n#### yallist.shift()\n\nGet the data from the list head, and remove the head from the list.\n\n#### yallist.slice([from], [to])\n\nJust like Array.slice, but returns a new Yallist.\n\n#### yallist.sliceReverse([from], [to])\n\nJust like yallist.slice, but the result is returned in reverse.\n\n#### yallist.toArray()\n\nCreate an array representation of the list.\n\n#### yallist.toArrayReverse()\n\nCreate a reversed array representation of the list.\n\n#### yallist.unshift(item, ...)\n\nInsert one or more items to the head of the list.\n\n#### yallist.unshiftNode(node)\n\nMove a Node object to the front of the list.  (That is, pull it out of\nwherever it lives, and make it the new head.)\n\nIf the node belongs to a different list, then that list will remove it\nfirst.\n\n#### yallist.pushNode(node)\n\nMove a Node object to the end of the list.  (That is, pull it out of\nwherever it lives, and make it the new tail.)\n\nIf the node belongs to a list already, then that list will remove it\nfirst.\n\n#### yallist.removeNode(node)\n\nRemove a node from the list, preserving referential integrity of head\nand tail and other nodes.\n\nWill throw an error if you try to have a list remove a node that\ndoesn't belong to it.\n\n### Yallist.Node\n\nThe class that holds the data and is actually the list.\n\nCall with `var n = new Node(value, previousNode, nextNode)`\n\nNote that if you do direct operations on Nodes themselves, it's very\neasy to get into weird states where the list is broken.  Be careful :)\n\n#### node.next\n\nThe next node in the list.\n\n#### node.prev\n\nThe previous node in the list.\n\n#### node.value\n\nThe data the node contains.\n\n#### node.list\n\nThe list to which this node belongs.  (Null if it does not belong to\nany list.)\n",
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