add: solution for bracket-matcher🚀

bracket-matcher/README.md

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+# Bracket Matcher
+
+Have the function `BracketMatcher(str)` take the `str` parameter being passed and return `1` if the brackets are correctly matched and each one is accounted for. Otherwise return `0`. For example: if `str` is "(hello (world))", then the output should be `1`, but if `str` is "((hello (world))" the the output should be `0` because the brackets do not correctly match up. Only "(" and ")" will be used as brackets. If `str` contains no brackets return `1`.
+
+## Examples
+
+```javascript
+BracketMatcher('(hello (world))'); // should == 1
+BracketMatcher('((hello (world))'); // should == 0
+```
+
+## Execute
+
+```bash
+node solution.js
+```

bracket-matcher/solution.js

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+function BracketMatcher(str) {
+  if (!str) return 1;
+
+  let opens = 0;
+  for (let i = 0; i < str.length; i++) {
+    if (str[i] === '(') opens++;
+    if (str[i] === ')') opens--;
+    if (opens < 0) return 1;
+  }
+
+  return opens ? 0 : 1;
+}
+
+(() => {
+  ['(hello (world))', '((hello (world))', undefined, null].forEach((str) => {
+    console.log(str, '==', BracketMatcher(str));
+  });
+})();