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String: 20. Valid Parentheses

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	`1`	`+// https://leetcode.com/problems/valid-parentheses/description/`
	`2`	`+/**`
	`3`	`+ * 20. Valid Parentheses`
	`4`	`+ * @param {string} s`
	`5`	`+ * @return {boolean}`
	`6`	`+ */`
	`7`	`+const map = {`
	`8`	`+ '(': ')',`
	`9`	`+ '{': '}',`
	`10`	`+ '[': ']',`
	`11`	`+};`
	`12`	`+var isValid = function(s) {`
	`13`	`+ if (s.length % 2 !== 0) return false;`
	`14`	`+ const stack = [];`
	`15`	`+ for (let i = 0; i < s.length; i++) {`
	`16`	`+ if (map[s[i]]) {`
	`17`	`+ stack.push(s[i]);`
	`18`	`+ } else if (s[i] === map[stack.pop()]) {`
	`19`	`+ continue`
	`20`	`+ } else {`
	`21`	`+ return false;`
	`22`	`+ }`
	`23`	`+ }`
	`24`	`+ if (stack.length > 0) return false;`
	`25`	`+ return true;`
	`26`	`+};`
	`27`	`+isValid('()[]{}');`
	`28`	`+isValid('()');`
	`29`	`+isValid('([)]');`
	`30`	`+isValid('{[]}');`
	`31`	`+isValid('');`

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