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Update 58-Length-Of-Last-Word.js

Added another approach for length-of-last-word in JS.

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Original file line number	Diff line number	Diff line change
`@@ -13,3 +13,21 @@`
`13`	`13`	`}`
`14`	`14`	`returnlen;`
`15`	`15`	`};`
	`16`	`+`
	`17`	`+// another approach. starting out from the last so we don't have to go all the way to the end.`
	`18`	`+varlengthOfLastWord=function(s){`
	`19`	`+`
	`20`	`+letfirstCharOccurance=false;`
	`21`	`+letlastWordLen=0;`
	`22`	`+`
	`23`	`+for(leti=s.length-1;i>-1;i--){`
	`24`	`+if(s[i]!==' '){`
	`25`	`+firstCharOccurance=true;`
	`26`	`+lastWordLen++;`
	`27`	`+}`
	`28`	`+if(firstCharOccurance&&s[i]===' '){`
	`29`	`+break;`
	`30`	`+}`
	`31`	`+}`
	`32`	`+returnlastWordLen;`
	`33`	`+};`

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