Results for “type guard”
Small, practical examples. Search by task or narrow things down below.
Produce a lazy sequence with a generator
TypeScript: A generator yields one value per iteration without building an intermediate array.
TypeScript✓ Tested
Provide a fallback for a nullable value
C#: The null-coalescing operator supplies a default only when the left side is null.
C#✓ Tested
Read an ISO-style weekday number
TypeScript: Convert Sunday from zero to seven when using Monday-through-Sunday numbering.
TypeScript✓ Tested
Read an object’s own enumerable values
TypeScript: Object.values provides values without their corresponding keys.
TypeScript✓ Tested
Read date components in UTC
TypeScript: UTC accessors avoid differences caused by the machine’s local timezone.
TypeScript✓ Tested
Read named regex capture groups
TypeScript: Named groups make a fixed input format easier to inspect than numeric group positions.
TypeScript✓ Tested
Read one character from ASCII text
TypeScript: Use a valid zero-based index to read the first character.
TypeScript✓ Tested
Read the beginning of a text value
TypeScript: Extract or display the first three ASCII characters from a known nonempty string.
TypeScript✓ Tested
Read the final array item with a negative index
TypeScript: at supports negative positions counted from the end.
TypeScript✓ Tested
Read the first collection element
TypeScript: Access index zero only after establishing that the collection is nonempty.
TypeScript✓ Tested
Read the kind of command being invoked
PowerShell: CommandType distinguishes cmdlets from functions, aliases, and external applications.
PowerShell✓ Tested
Recover from an expected promise rejection
TypeScript: Return a fallback from catch so later handlers receive an ordinary resolved value.
TypeScript✓ Tested