Results for “utility type”
Small, practical examples. Search by task or narrow things down below.
Derive comparison and debugging behavior
Derive comparison and debugging behavior in a complete Rust program using the standard library.
Rust✓ Tested
Detect an invalid Date object
TypeScript: An invalid Date has a NaN time value.
TypeScript✓ Tested
Detect NaN without converting the input
TypeScript: Number.isNaN tests the special numeric value instead of applying string-to-number conversion.
TypeScript✓ Tested
Display a label in uppercase without changing its text
CSS: Text-transform changes visual casing while preserving the DOM’s source text.
CSS✓ Tested
Display a number with a fixed decimal width
TypeScript: toFixed returns a formatted string rather than a numeric value.
TypeScript✓ Tested
Distinguish an own property from an inherited one
TypeScript: Object.hasOwn avoids depending on an object’s possibly shadowed hasOwnProperty method.
TypeScript✓ Tested
Divide using a fractional number
TypeScript: Use a floating-point operand to preserve the fractional part of a division.
TypeScript✓ Tested
Drop the fractional part toward zero
TypeScript: Math.trunc differs from floor for negative inputs.
TypeScript✓ Tested
Embed a struct for shared fields
Embed a struct for shared fields using a complete Go program with explicit sample inputs.
Go✓ Tested
Explain a calculation with a comment
TypeScript: Keep the code executable while documenting why a fixed input is used.
TypeScript✓ Tested
Extract all regex matches with their groups
TypeScript: matchAll requires a global regular expression and returns an iterator of matches.
TypeScript✓ Tested
Extract text by start and end positions
TypeScript: String slice uses an inclusive start and exclusive end measured in UTF-16 code units.
TypeScript✓ Tested