Commit 2ac29c8

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First Duplicate

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	`1`	`+// First Duplicate`
	`2`	`+// Write a function that takes in an array of positive numbers and returns the first number that is duplicated. If no duplicates occur, return -1.`
	`3`	`+`
	`4`	`+const firstDuplicate = numArr => {`
	`5`	`+ const containerObj = {}`
	`6`	`+`
	`7`	`+ for (const num of numArr) {`
	`8`	`+ if (containerObj[num]) {`
	`9`	`+ return num`
	`10`	`+ }`
	`11`	`+ containerObj[num] = 1`
	`12`	`+ }`
	`13`	`+ return -1`
	`14`	`+}`
	`15`	`+`
	`16`	`+console.log(firstDuplicate([2, 3, 3, 1, 5, 2]))`
	`17`	`+console.log(firstDuplicate([2, 2]))`
	`18`	`+console.log(firstDuplicate([2, 1, 3]))`

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