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String: 387. First Unique Character in a String

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	`1`	`+// https://leetcode.com/problems/first-unique-character-in-a-string/description/`
	`2`	`+/**`
	`3`	`+ * 387. First Unique Character in a String`
	`4`	`+ * @param {string} s`
	`5`	`+ * @return {number}`
	`6`	`+ */`
	`7`	`+var firstUniqChar = function(s) {`
	`8`	`+ const map = new Map();`
	`9`	`+ for (let i = 0; i < s.length; i++) {`
	`10`	`+ if (map.get(s[i]) === undefined) {`
	`11`	`+ map.set(s[i], 1);`
	`12`	`+ } else {`
	`13`	`+ map.set(s[i], map.get(s[i]) + 1);`
	`14`	`+ }`
	`15`	`+ }`
	`16`	`+ for (let item of map) {`
	`17`	`+ if (item[1] === 1) {`
	`18`	`+ return s.indexOf(item[0]);`
	`19`	`+ }`
	`20`	`+ }`
	`21`	`+ return -1;`
	`22`	`+};`
	`23`	`+var firstUniqChar = function(s) {`
	`24`	`+ const set = new Set();`
	`25`	`+ for (let i = 0; i < s.length; i++) {`
	`26`	`+ if (!set.has(s[i]) && s.lastIndexOf(s[i]) === i) {`
	`27`	`+ return i;`
	`28`	`+ } else {`
	`29`	`+ set.add(s[i]);`
	`30`	`+ }`
	`31`	`+ }`
	`32`	`+ return -1;`
	`33`	`+};`

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