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App Inventor 2 项目合并工具
本文档最初由米尔斯学院（Mills College）的 Kate Feeney 为 AI Classic 编写。该计...
How can I round a number in JavaScript? .toFixed() returns a string?
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It returns a string because 0.1, and powers thereof (which are used to display decimal fraction...
Android Fragment lifecycle over orientation changes
Using the compatibility package to target 2.2 using Fragments.
7 Answers
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Multiply TimeSpan in .NET
...= TimeSpan.FromMinutes(1);
duration = TimeSpan.FromTicks(duration.Ticks * 12);
Console.WriteLine(duration);
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Is there a way to pass optional parameters to a function?
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The Python 2 documentation, 7.6. Function definitions gives you a couple of ways to detect whether a caller supplied an optional parameter.
First, you can use special formal parameter syntax *. If the function definition has a formal p...
WCF chokes on properties with no “set ”. Any workaround?
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edited Feb 24 '10 at 2:45
answered Feb 24 '10 at 2:34
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List comprehension vs map
...n map needs a lambda:
$ python -mtimeit -s'xs=range(10)' 'map(lambda x: x+2, xs)'
100000 loops, best of 3: 4.24 usec per loop
$ python -mtimeit -s'xs=range(10)' '[x+2 for x in xs]'
100000 loops, best of 3: 2.32 usec per loop
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Pointers in C: when to use the ampersand and the asterisk?
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You have pointers and values:
int* p; // variable p is pointer to integer type
int i; // integ...
Benchmarking (python vs. c++ using BLAS) and (numpy)
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quick random row selection in Postgres
... myid FROM mytable OFFSET floor(random()*N) LIMIT 1;
Consider a table of 2 rows; random()*N generates 0 <= x < 2 and for example SELECT myid FROM mytable OFFSET 1.7 LIMIT 1; returns 0 rows because of implicit rounding to nearest int.
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