OO structure question of building a post system that can create notes on a screen.
describe how you would do UNDO function.
give 2 answers, one should be fast, the other low memory.

Question

OO structure question of building a post system that can create notes on a screen.
describe how you would do UNDO function.
give 2 answers, one should be fast, the other low memory.

Sigiloso · Accepted Answer

1. fast solution - keep the screen state at each iteration (high memory), but then after doing UNDO just return to the last screen (no need to re-draw all the notes).
2. memory solution - keep the drawing of screen and notes in a stack, each UNDO just pop the stack and re-draw the stack.

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