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Added valid parentheses code #30

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Added valid parentheses code #30

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22 changes: 22 additions & 0 deletions DSA/Javascript/Valid_Parentheses.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
// time O(n) | space O(n)
var isValid = function (s) {
const stack = [];

const brackets = {
'(': ')',
'[': ']',
'{': '}',
};

for (const char of s) {
if (char in brackets) {
stack.push(brackets[char]);
} else if (stack.length && stack[stack.length - 1] === char) {
stack.pop();
} else {
return false;
}
}

return !stack.length;
};