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TypeScript
invariant() — Always-On Assertion
Throw if a condition is false, with TypeScript narrowing the type afterwards. Replaces ad-hoc `if (!x) throw` ladders and gives you type-safe guards in one line.
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TypeScript
Crypto-Strong Random Password
Generate a strong random password in browser or modern Node. Uses crypto.getRandomValues with rejection sampling for an unbiased distribution.
TypeScript
Type-Safe Event Emitter
A 30-line type-safe mini EventEmitter. The event-name → payload map is enforced at compile time, so emit and on calls can't drift apart.
TypeScript
isWithinInterval — Date Range Check
Inclusive check that a date falls between two boundaries. Tiny but constantly useful for filtering rows by date range, validating bookings, etc.
TypeScript
Deep Clone with structuredClone
Forget JSON.parse(JSON.stringify(...)) — modern runtimes (Node 17+, all current browsers) ship structuredClone, which handles Dates, Maps, Sets, typed arrays, and cycles correctly.
TypeScript
safeJsonParse — Result-Typed
Parse JSON without ever throwing. Returns a Result-like discriminated union so callers must handle both success and failure paths at compile time.
TypeScript
Mapped Types (Partial/Required/etc)
Mapped types iterate over keys to produce new types. The standard library's `Partial`, `Required`, `Readonly`, `Pick`, `Omit`, `Record` are all one-liners — and you can build your own.
TypeScript
Throttle (leading-edge, typed)
Pair to debounce: fire on the first call, then ignore further calls for `interval` ms. Useful for rate-limiting scroll handlers or button clicks.
Python
Word-Safe Truncate
Cap a string at `max_len` chars without splitting a word; append an ellipsis when truncated. Backs off to the last space if cutting mid-word would happen.
TypeScript
Truncate at Word Boundary
Cap a string at `max` characters without splitting a word, appending an ellipsis when truncated. Falls back gracefully if the last word is longer than `max`.
TypeScript
Lazy Singleton (no class)
Lazily construct an expensive object exactly once, with TypeScript inferring the return type from the factory. Cleaner than the class-trait singleton pattern for module-scoped state.
TypeScript
groupBy (with key callback)
Group a list into a record keyed by whatever the callback returns. Like Lodash _.groupBy or the new Object.groupBy in modern runtimes. Generic enough to handle string, number, or symbol keys.
TypeScript
clamp / lerp / mapRange
Three numeric utilities you reach for constantly in animation, UI math, and audio code. Generic enough to use anywhere, no Math.* dance required.
PHP
Try / Retry With Logging
Run a callable up to N times; log each failed attempt and bubble the last exception. Compact, no dependencies, useful for transient failures (S3 puts, email sends, etc.).
TypeScript
zip — Pair Two Arrays
Pair items from two arrays positionally into tuples. The result's length is the shorter of the two inputs. Useful for parallel arrays (labels + values, headers + rows).
TypeScript
Debounce (typed)
Wait until the caller stops invoking for `delay` ms, then call the function with the most recent arguments. The TS version preserves the original signature so the returned function has the same parameters.