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Is Digit

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	`1`	`+// Is Digit`
	`2`	`+// Write a function that takes in a STRING and returns a boolean on whether or not it is a digit. A digit is defined as a number between 0-9`
	`3`	`+`
	`4`	`+const isDigit = str => {`
	`5`	`+ if (str.length !== 1) return false`
	`6`	`+ return '0123456789'.includes(str)`
	`7`	`+}`
	`8`	`+`
	`9`	`+console.log(isDigit('16'))`
	`10`	`+console.log(isDigit('6'))`
	`11`	`+console.log(isDigit('d'))`

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