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ReactForms & validation

Control a multiline text field

Control a multiline text field with a small React component and explicit browser behavior.

React✓ Tested
ReactGetting Started

Control a text input

Control a text input with a small React component and explicit browser behavior.

React✓ Tested
C++Text validation & parsing

Convert ASCII text to lowercase safely

C++: Cast each byte to unsigned char before using the cctype function.

C++✓ Tested
CBinary formats & structured parsing

Convert ASCII text to lowercase safely

C: Cast to unsigned char before calling ctype functions on a possibly signed char.

C✓ Tested
CStrings

Convert ASCII text to uppercase

Convert characters with toupper while avoiding signed-char undefined behavior.

C✓ Tested
PowerShellStructured formats & encodings

Convert between hexadecimal text and bytes

PowerShell: Use the .NET hexadecimal helpers instead of parsing byte pairs manually.

PowerShell✓ Tested
PythonText validation & encoding

Convert hexadecimal text to bytes

Python: Use bytes.fromhex for a readable byte representation and hex for the reverse conversion.

Python✓ Tested
PythonGetting Started

Convert known numeric text to an integer

Python: Convert a trusted literal to an integer before adding. Validate external input before converting it.

Python✓ Tested
C#Getting Started

Convert known numeric text to an integer

C#: Convert a trusted literal to an integer before adding. Validate external input before converting it.

C#✓ Tested
JavaGetting Started

Convert known numeric text to an integer

Java: Convert a trusted literal to an integer before adding. Validate external input before converting it.

Java✓ Tested
JavaScriptGetting Started

Convert known numeric text to an integer

JavaScript: Convert a trusted literal to an integer before adding. Validate external input before converting it.

JavaScript✓ Tested
TypeScriptGetting Started

Convert known numeric text to an integer

TypeScript: Convert a trusted literal to an integer before adding. Validate external input before converting it.

TypeScript✓ Tested