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Merge pull requestneetcode-gh#103 from ediazmen/Exercise-125

JS 125-Valid-Palindrome

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	`1`	`+classisValidPalindrome{`
	`2`	`+constructor(string){`
	`3`	`+this.string=string;`
	`4`	`+}`
	`5`	`+isPalindrome(string){`
	`6`	`+letleft=0;`
	`7`	`+letright=string.length-1;`
	`8`	`+while(left<right){`
	`9`	`+while(left<right&&this.isAlphaNumeric(string[left])){`
	`10`	`+left++`
	`11`	`+}`
	`12`	`+while(right>left&&this.isAlphaNumeric(string[right])){`
	`13`	`+right--`
	`14`	`+}`
	`15`	`+if(string[left].toLowerCase()!=string[right].toLowerCase()){`
	`16`	`+returnfalse;`
	`17`	`+}`
	`18`	`+left++`
	`19`	`+right--`
	`20`	`+}`
	`21`	`+returntrue`
	`22`	`+}`
	`23`	`+`
	`24`	`+isAlphaNumeric(c){`
	`25`	`+return('A'.charCodeAt(0)<=c.charCodeAt(0)<='Z'.charCodeAt(0)\|\|`
	`26`	`+'a'.charCodeAt(0)<=c.charCodeAt(0)<='z'.charCodeAt(0)\|\|`
	`27`	`+'0'.charCodeAt(0)<=c.charCodeAt(0)<='9'.charCodeAt(0))`
	`28`	`+}`
	`29`	`+`
	`30`	`+}`

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