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App Inventor 2 列表代码块 · App Inventor 2 中文网
...表，子列表的成员本身并不是列表的成员。
例如列表 [1,2,[3,4]] 的成员为1、2，列表[3 4]， 3 和 4 本身不是列表的成员。
求列表长度
返回列表中的项目数。
列表是否为空？
如果列表没有项目，则返回 真， 否则，返回 假...
Why doesn't ruby support method overloading?
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Method overloading can be achieved by declaring two methods with the same name and different s...
Circle line-segment collision detection algorithm?
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// either solution may be on or off the ray so need to test both
// t1 is always the smaller value, because BOTH discriminant and
// a are nonnegative.
float t1 = (-b - discriminant)/(2*a);
float t2 = (-b + discriminant)/(2*a);
// 3x HIT cases:
// -o-> --|--&...
Is 0 a decimal literal or an octal literal?
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Yes, 0 is an Octal literal in C++.
As per the C++ Standard:
2.14.2 Integer literals [lex.icon]
integer-literal:
decimal-literal integer-suffixopt
octal-literal integer-suffixopt
hexadecimal-literal integer-suffixopt
decimal-literal:
nonzero-digit
decim...
Branch from a previous commit using Git
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What is the fastest integer division supporting division by zero no matter what the result is?
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107
Inspired by some of the comments I got rid of the branch on my Pentium and gcc compiler using
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Check if object value exists within a Javascript array of objects and if not add a new object to arr
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Can I replace groups in Java regex?
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Use $n (where n is a digit) to refer to captured subsequences in replaceFirst(...). I'm assumi...
Get the client's IP address in socket.io
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get list of pandas dataframe columns based on data type
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