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Update: Added Unary Operator in SumOfDigits algorithm (TheAlgorithms#1348)

* Update: Added Unary Operator in SumOfDigits algorithm * Update: Added Unary Operator in SumOfDigits algorithm

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Original file line number	Diff line number	Diff line change
`@@ -8,12 +8,11 @@`
`8`	`8`	`/*`
`9`	`9`	`The given input is converted to a string, split into an array of characters.`
`10`	`10`	`This array is reduced to a number using the method <Array>.reduce`
`11`		`- NOTE: The final parseInt is just there in cases where 1 digit numbers are given, since without that it would result in a String output.`
`12`	`11`	`*/`
`13`	`12`	`function sumOfDigitsUsingString (number) {`
`14`	`13`	`if (number < 0) number = -number`
`15`	`14`
`16`		`- return Number.parseInt(number.toString().split('').reduce((a, b) => Number(a) + Number(b)))`
	`15`	`+ return +(number.toString().split('').reduce((a, b) => (+a) + (+b)))`
`17`	`16`	`}`
`18`	`17`
`19`	`18`	`/*`

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