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Merge pull requestneetcode-gh#1419 from imevanc/Create-876-Middle-Of-The-Linked-List.js

Create: 876-Middle-Of-The-Linked-List.js

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	`1`	`+/**`
	`2`	`+ * https://leetcode.com/problems/middle-of-the-linked-list/`
	`3`	`+ * Definition for singly-linked list.`
	`4`	`+ * function ListNode(val, next) {`
	`5`	`+ * this.val = (val===undefined ? 0 : val)`
	`6`	`+ * this.next = (next===undefined ? null : next)`
	`7`	`+ * }`
	`8`	`+ */`
	`9`	`+/**`
	`10`	`+ *@param {ListNode} head`
	`11`	`+ *@return {ListNode}`
	`12`	`+ */`
	`13`	`+varmiddleNode=function(head){`
	`14`	`+letfirst=head;`
	`15`	`+letsecond=head;`
	`16`	`+while(second!=null&&second.next!=null){`
	`17`	`+first=first.next;`
	`18`	`+second=second.next.next;`
	`19`	`+}`
	`20`	`+returnfirst;`
	`21`	`+};`

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