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Tagged with collections

7 cards

Python Medium Theory

These helpers reduce boilerplate for grouping, counting, queue behavior, lightweight record types, partial application, reduction, and memoization.

#collections #python #stdlib

collections and functools helpers: `defaultdict`, `Counter`, `deque`, `namedtuple`, `partial`, `reduce`, and `lru_cache`

Python Easy Theory

Dictionaries map keys to values and are optimized for fast lookup, update, and membership by key.

#collections #dict #python

Dictionary operations, iteration, and methods

Python Easy Theory

Lists are mutable ordered sequences that support indexing, slicing, appending, extending, and in-place updates.

#collections #lists #python

List operations, methods, slicing, and negative indexing

Python Easy Theory

Sets support fast membership checks and mathematical operations like union, intersection, difference, and symmetric difference.

#collections #python #sets

Set operations and frozenset in Python

Python Easy Theory

List comprehensions build lists concisely from an iterable, often replacing small loops plus append calls.

#collections #python #syntax

What is list comprehension in Python?

JavaScript Medium Theory

JavaScript has keyed and set-like collections beyond plain objects and arrays, including weak collections for object-keyed references.

#collections #data-structures #javascript

Collections in JavaScript: Set, Map, WeakSet, and WeakMap

Coding Exercises Easy O(1)

Wrap a `deque` inside a small class so enqueue uses `append`, dequeue uses `popleft`, and peek reads the leftmost item without removing it.

Implement a queue with enqueue, dequeue, and peek operations.

#collections #python #queue