#Arrays

9 snippets

• JavaScript Tested

  Remove duplicates from an array

  Deduplicate primitives with a Set, or objects by a key or computed value, keeping the first occurrence.

• JavaScript Tested

  Sort an array by multiple keys

  Sort objects by one field, then break ties with another, with ascending or descending order per field.

• TypeScript Tested

  Non-empty array type

  Encode "at least one element" in the type so head, max and similar functions never see an empty array.

• PHP Tested

  Group an array of records by a key

  Turn a flat list of associative arrays into groups keyed by a field or callback.

• TypeScript Tested

  Generic groupBy with key inference

  Group an array into a Record by a property or function while keeping the item type.

• JavaScript Tested

  Flatten nested arrays

  Flatten arrays to any depth with a small recursive helper that mirrors Array.prototype.flat.

• TypeScript Tested

  Type-safe pick and omit helpers for objects

  Copy selected keys from an object (or drop some) with return types that match at compile time.

• JavaScript Tested

  Group an array of objects by a key

  Build an object of arrays keyed by a property or computed value, using Object.groupBy or a reduce fallback.

• JavaScript Tested

  Split an array into chunks

  Break an array into fixed-size pieces, useful for batching API calls or database inserts.