Rust Result and Option Exercises with Solutions and Explanations

Rust Result and Option types Exercises [9 exercises with solution and Explanation]

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1. Write a Rust function that returns an Option<String> representing the result of parsing a string into an integer.

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2. Write a Rust function that takes a vector of integers and returns the maximum value, return None if the vector is empty.

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3. Write a Rust function that reads a file and returns Result<String, std::io::Error>, where the string contains the file's contents.

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4. Write a Rust function that calculates the square root of a non-negative number and returns Option<f64>, where None is returned for negative inputs.

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5. Write a Rust function that parses a date string in the format "YYYY-MM-DD" and returns Result<(i32, u32, u32), &str> indicating the year, month, and day, or an error message.

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6. Write a Rust function that takes a string and returns Option<usize> representing the string length, returning None for empty strings.

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7. Write a Rust function that converts a hexadecimal string to an integer and returns Option<u64>, returning None for invalid input.

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8. Write a Rust function that divides two numbers and returns Result<f64, &'static str>, indicating success or division by zero error.

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9. Write a Rust function that filters odd numbers from a vector of integers and returns Option<Vec<i32>>, returning None if the input vector is empty.

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