#217 Validate Parentheses

Write a function that takes a string s containing bracket characters: '(', ')', ', ', '[', ']'.

Determine if the string is valid by checking these rules:

1. Each opening bracket must have a matching closing bracket of the same type
2. Brackets must be closed in the proper nested order
3. A closing bracket can only close a matching opening bracket

The function should return true for valid bracket strings, and false for invalid ones.

Constraints:

• 1 ≤ s.length ≤ 1000
• s consists of parentheses only '()[]'

Examples:

// Example 1:

const s1 = "[]";
console.log(isValid(s1));
// Output: true


// Example 2:

const s2 = "([{}])";
console.log(isValid(s2));
// Output: true


// Example 3:

const s3 = "[(])";
console.log(isValid(s3));
// Output: false

// Explanation: The brackets are not closed in the correct order.