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Add 히샤드-수.js

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Original file line number	Diff line number	Diff line change
`@@ -35,3 +35,13 @@ function solution(x) {`
`35`	`35`
`36`	`36`	`return (x % sum == 0) ? true : false; // 자릿수의 합으로 x가 나누어지면 하샤드 수`
`37`	`37`	`}`
	`38`	`+`
	`39`	`+//정답 4 - prove-ability`
	`40`	`+function solution(x) {`
	`41`	`+ var answer = true;`
	`42`	`+ // 모든 자릿수의 합을 구한다`
	`43`	`+ const sum = x.toString().split("").reduce((acc, cur) => acc + parseInt(cur, 10), 0);`
	`44`	`+ // x가 자릿수의 합으로 나누어떨어지지 않는다면 false 반환`
	`45`	`+ if(x % sum !== 0) return false`
	`46`	`+ return answer;`
	`47`	`+}`

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