69. JSON.parse - Simple

Implement a simplified version of JSON.parse that converts JSON strings back to JavaScript values.

Given a JSON string, parse it and return the corresponding JavaScript value. Your implementation should handle:

• Primitives: numbers, strings, booleans, null
• Arrays: arrays of any supported types
• Objects: plain objects with string keys

1. Basic Functionality

• Parse numbers (integers and floats)
• Parse strings with proper unescaping
• Parse booleans ("true" and "false")
• Parse null
• Parse arrays (comma-separated values in brackets)
• Parse objects (comma-separated key-value pairs in braces)

Examples

parse('42');                    // 42
parse('"hello"');               // "hello"
parse('true');                  // true
parse('null');                  // null
parse('[1,2,3]');              // [1, 2, 3]
parse('{"a":1,"b":2}');        // {a: 1, b: 2}