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Whether a variable is undefined [duplicate]
... Please use typeof(var) === 'undefined' as undefined is not a constant in JavaScript.
– JonnyReeves
Feb 12 '12 at 10:21
26
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How to get current location in Android [duplicate]
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App Inventor 2 AI伴侣有电脑版的吗? - App Inventor 2 中文网 - 清泛网 - 专注C/C++及内核技术
...展的App一律不支持iOS版AI伴侣的测试，因为拓展目前都是java/kotlin写的安卓平台程序，可能未来待iOS平台成熟后，会有swift苹果版拓展。
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《App Inventor 2 连接：AI伴侣 + 模拟器 + USB（完整版）》
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《App...
App Inventor 2 连接方式：AI伴侣、模拟器、USB · App Inventor 2 中文网
...展的App一律不支持iOS版AI伴侣的测试，因为拓展目前都是java写的安卓平台程序，可能未来待iOS平台成熟后，会有swift苹果版拓展。
视频演示
完整版
《App Inventor 2 连接：AI伴侣 + 模拟器 + USB（完整版）》
分集介绍
《App Invento...
Any good boolean expression simplifiers out there? [closed]
... Logic Friday. Plus it doesn't require installation and is multi-platform (Java).
Also in Logic Friday the expression A | B just returns 3 entries in truth table; I expected 4.
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Mock framework vs MS Fakes frameworks
...wiring" configuration/complexity. I have seen a few projects already (both Java and .NET) which had hundreds of Java/C# interfaces with only a single implementing class, and lots of useless XML configuration (for Spring DI beans, or in Web.config for the MS Unity framework). Such dependencies are be...
Why are regular expressions so controversial? [closed]
...g. That's why you have to carefully tune your regular expressions in Perl, Java, Python, Ruby… Old-style regular expression engines (in grep, for example) first compile the pattern to a DFA. Afterwards, the complexity of the pattern is largely irrelevant. I just used Java and grep for the same tex...
Scala: What is a TypeTag and how do I use it?
...e == or !=, unless you absolutely know what you do:
scala> typeOf[List[java.lang.String]] =:= typeOf[List[Predef.String]]
res71: Boolean = true
scala> typeOf[List[java.lang.String]] == typeOf[List[Predef.String]]
res72: Boolean = false
The latter checks for structural equality, which often...
How to use BigInteger?
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BigInteger is immutable. The javadocs states that add() "[r]eturns a BigInteger whose value is (this + val)." Therefore, you can't change sum, you need to reassign the result of the add method to sum variable.
sum = sum.add(BigInteger.valueOf(i));
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Are Exceptions in C++ really slow
.....finally construct can be implemented without stack unwinding. F#, C# and Java all implement try..finally without using stack unwinding. You just longjmp to the handler (as I already explained).
– J D
Mar 20 '14 at 21:37
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