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Added 9. Palindrome Number

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Original file line number	Diff line number	Diff line change
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	`1`	`+/**`
	`2`	`+ *@param {number} x`
	`3`	`+ *@return {boolean}`
	`4`	`+ */`
	`5`	`+varisPalindrome=function(x){`
	`6`	`+`
	`7`	`+// Creates array from int characters`
	`8`	`+// 121 -> [1,2,1]`
	`9`	`+letarr=Array.from(String(x),Number);`
	`10`	`+`
	`11`	`+// Uses two pointer`
	`12`	`+for(leti=0;i<arr.length;i++){`
	`13`	`+if(arr[i]!==arr[arr.length-1-i]){`
	`14`	`+returnfalse;`
	`15`	`+}`
	`16`	`+}`
	`17`	`+`
	`18`	`+returntrue;`
	`19`	`+};`
	`20`	`+`
	`21`	`+`
	`22`	`+// Runtime: 302 ms, faster than 40.50% of JavaScript online submissions for Palindrome Number.`
	`23`	`+// Memory Usage: 51.8 MB, less than 8.36% of JavaScript online submissions for Palindrome Number.`
	`24`	`+`

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