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problem-25.js solved

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,25 @@`
	`1`	`+let digits = [4, 3, 2, 1];`
	`2`	`+`
	`3`	`+let plusOne = function (digits) {`
	`4`	`+ let result = [];`
	`5`	`+`
	`6`	`+ // last element from digits[]`
	`7`	`+ let lastElement = digits.pop() + 1;`
	`8`	`+`
	`9`	`+ // split lastElement and convert it to Number`
	`10`	`+ let getLastDigit = String(lastElement)`
	`11`	`+ .split('')`
	`12`	`+ .map((i) => Number(i));`
	`13`	`+`
	`14`	`+ // check the last element is greater than 1 && last digit is 0`
	`15`	`+ if (String(lastElement) > 9 && getLastDigit[getLastDigit.length - 1] === 0) {`
	`16`	`+ result = digits.concat(getLastDigit);`
	`17`	`+ } else {`
	`18`	`+ result = digits.concat(getLastDigit);`
	`19`	`+ }`
	`20`	`+`
	`21`	`+ // final Array`
	`22`	`+ return result;`
	`23`	`+};`
	`24`	`+`
	`25`	`+console.log(plusOne(digits));`

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