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Ideas and Concepts
11. what is Composition? create a pipe()
12. implement Immutability helper
14. Implement a general memoization function - `memo()`
15. implement a simple DOM wrapper to support method chaining like jQuery
46. implement `_.once()`
52. create a middleware system
56. call APIs with pagination
64. auto-retry Promise on rejection
117. event delegation
122. implement memoizeOne()
