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The idea to solve the problem is set five variable, first direction, we need to switch direction after we finish printing one row or one column. Then 阅读全文
posted @ 2019-03-28 03:23
Zhentiw
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Here we refactor a React TypeScript class component to a function component with a useState hook and discuss how props and state types can be modeled 阅读全文
posted @ 2019-03-27 21:00
Zhentiw
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Because @types/react has to expose all its internal types, there can be a lot of confusion over how to type specific patterns, particularly around hig 阅读全文
posted @ 2019-03-27 20:45
Zhentiw
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Imaging we have a deck of cards, eveytimes we need to pick one card from deck, the result we want to have is: For selected, each time we want only one 阅读全文
posted @ 2019-03-27 19:17
Zhentiw
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Give you set of meetings start time and end time, count how many meeting rooms needed. For example: We can use a memo table to store the at which time 阅读全文
posted @ 2019-03-27 02:03
Zhentiw
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If we pushed our changes already to the remote repository we have to pay attention to not change the git history (using commands like rebase, reset, a 阅读全文
posted @ 2019-03-26 20:54
Zhentiw
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When you accidentally committed some changes to your branch you have various possibilities to “undo” that operation and add some more changes. One is 阅读全文
posted @ 2019-03-26 20:51
Zhentiw
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By given an array [1,2,3]: Return all possible combinations. for example: [[], [1], [2], [3], [1, 2].... [1,2,3]] 阅读全文
posted @ 2019-03-26 20:18
Zhentiw
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Using Naive JS: The main problem is inside 'rando' function, not really a FP way doing stuff. Arrow approach: It becomes complex with we need to do Pa 阅读全文
posted @ 2019-03-26 17:15
Zhentiw
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We don't need to 阅读全文
posted @ 2019-03-26 00:35
Zhentiw
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