Hiro Docs

Function Signature

(string-to-uint? string)

Input: (string-ascii 1048576) | (string-utf8 262144)
Output: (optional uint)

Why it matters

The string-to-uint? function is crucial for:

1Converting string representations of numbers to unsigned integers.
2Implementing logic that requires numeric values from string inputs.
3Ensuring data integrity by validating string-to-unsigned-integer conversions.
4Simplifying the process of handling numeric conversions in smart contracts.

When to use it

Use string-to-uint? when you need to:

Convert a string representation of a number to an unsigned integer.
Implement logic that requires numeric values from string inputs.
Validate string-to-unsigned-integer conversions to ensure data integrity.
Handle numeric conversions in your smart contract.

Best Practices

Ensure the input string is correctly formatted and represents a valid unsigned integer.
Use meaningful variable names for better readability.
Combine with other string and numeric functions for comprehensive data management.
Handle the possible error cases to ensure robust contract behavior.

Practical Example: Converting a String to an Unsigned Integer

Let's implement a function that converts a string to an optional unsigned integer:

(define-read-only (convert-string-to-uint (input (string-ascii 20)))
  (string-to-uint? input)
)

;; Usage
(convert-string-to-uint "123") ;; Returns (some u123)
(convert-string-to-uint "456") ;; Returns (some u456)
(convert-string-to-uint "abc") ;; Returns none

This example demonstrates:

1Using string-to-uint? to convert a string to an optional unsigned integer.
2Implementing a public function to handle the string-to-unsigned-integer conversion.
3Handling both valid and invalid string inputs.

Common Pitfalls

1Using string-to-uint? with incorrectly formatted or invalid string inputs, causing the operation to return none.
2Assuming the conversion will always succeed, leading to unhandled error cases.
3Not handling all possible conditions, resulting in incomplete data management.
4Overlooking the need for proper error handling and validation.

string-to-int?: Converts a string to an optional signed integer.
int-to-ascii: Converts an integer to a string-ascii representation.
int-to-utf8: Converts an integer to a string-utf8 representation.

The string-to-uint? function is a fundamental tool for converting string representations of numbers to unsigned integers in Clarity smart contracts. It allows developers to implement logic that requires numeric values from string inputs, ensuring data integrity and simplifying numeric conversions. When used effectively, string-to-uint? enhances the reliability and maintainability of your smart contract code by providing a clear and concise way to handle string-to-unsigned-integer conversions.

string-to-uint?