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App Inventor 2 列表代码块 · App Inventor 2 中文网
...出异常、报错。
如果给定列表是一个二维列表，如 [["abc","123"],["xyz","456"]] ，则返回的列表项也是一个列表对象，如 ["abc","123"]。
求对象在列表中的位置
返回指定对象在列表中的位置，从 1 开始，如果不在...
Is there any way to redraw tmux window when switching smaller monitor to bigger one?
...to a remote server over ssh with Terminal.app. When you "tmux attach" with bigger resolution monitor from smaller one you previously started tmux, it draws dots around the console. It doesn't fit the new window size. Is there any way to redraw and clean the window? CTRL + L or CTRL - B + R doe...
what is the basic difference between stack and queue?
What is the basic difference between stack and queue??
11 Answers
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Git cherry pick vs rebase
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Since the time git cherry-pick learned to be able to apply multiple commits, the distinction indeed became somewhat moot, but this is something to be called convergent evolution ;-)
The true distinction lies in original intent to create both tools:
git rebase's ta...
ImportError: Cannot import name X
...ector, entity and physics. I will not post all the code, just the imports, because I think that's where the error is. (If you want, I can post more)
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What does [].forEach.call() do in JavaScript?
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[] is an array.
This array isn't used at all.
It's being put on the page, because using an array gives you access to array prototypes, like .forEach.
This is just faster than typing Array.prototype.forEach.call(...);
Next, forEach is a function which takes a function as an ...
What is the purpose of the “final” keyword in C++11 for functions?
...yword in C++11 for functions? I understand it prevents function overriding by derived classes, but if this is the case, then isn't it enough to declare as non-virtual your final functions? Is there another thing I'm missing here?
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In MySQL queries, why use join instead of where?
It seems like to combine two or more tables, we can either use join or where. What are the advantages of one over the other?
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Are string.Equals() and == operator really same? [duplicate]
Are they really same? Today, I ran into this problem. Here is the dump from the Immediate Window:
8 Answers
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String vs. StringBuilder
I understand the difference between String and StringBuilder ( StringBuilder being mutable) but is there a large performance difference between the two?
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