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Observer Pattern Explained With a Real Python Example
The observer pattern lets one object announce that something happened, and lets any number of other objects react to it. The announcer kee...
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System Design
Observer Pattern Explained With a Real Python Example
The observer pattern lets one object announce that something happened, and lets any number of other objects react to it. The announcer kee...
Code
Python list append time complexity: why it's amortized O(1)
Python's list.append is fast because a list is a dynamic array: one block of memory with spare slots. Most appends fill a spare slot. ...
Physics
What is momentum? Conservation of momentum and recoil
Momentum is mass times velocity (speed in a set direction): p = mv, in kilogram metres per second (kg m/s). When no outside force acts, th...
System Design
Strategy Pattern Explained With a Real Python Example
The strategy pattern hands one changeable step to a separate object. The code around it keeps the steps that never change, and calls one s...