Results for “Functions & types”
Small, practical examples. Search by task or narrow things down below.
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
Enforce a numeric range at a function boundary
PowerShell: ValidateRange performs argument validation before work begins.
PowerShell✓ 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
Extract the text after the last delimiter
TypeScript: Use lastIndexOf when earlier occurrences should remain part of the prefix.
TypeScript✓ Tested
Find members absent from another set
TypeScript: Negate a membership test to calculate the set difference.
TypeScript✓ Tested
Find shared members of two sets
TypeScript: Filter one set through the other set’s membership test.
TypeScript✓ Tested
Find the final day of a month
TypeScript: Day zero of the following UTC month selects the previous month’s final day.
TypeScript✓ Tested
Find the first matching array item
TypeScript: find returns undefined when no item satisfies the predicate.
TypeScript✓ Tested