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StringUtils 字符串工具扩展：强大的文本处理工具集 · App Inventor 2 中文网
...本填充
// 左填充到10位
设置 StringUtils1.Text 为 "123"
设置 Label1.Text 为 调用 StringUtils1.LeftPad(10, "0")
// 结果: "0000000123"
// 居中对齐
设置 StringUtils1.Text 为 "Hi"
设置 Label2.Text 为 调用 StringUtils1.Center(10, "*")
// 结果: "****Hi****"
...
地图组件（高德地图） · App Inventor 2 中文网
...每个块对应一个特定的URL。
默认高德地图简图模式：https://wprd01.is.autonavi.com/appmaptile?x={x}&y={y}&z={z}&style=7
可调整地图样式，变量说明如下：
域名前缀(wprd,webst)：效果一样，目前还没有找出规律。01 ~ 04 随意都可以，负载均衡...
Why is enum class preferred over plain enum?
...class Mammal { kangaroo, deer, human }; // another enum class
void fun() {
// examples of bad use of plain enums:
Color color = Color::red;
Card card = Card::green_card;
int num = color; // no problem
if (color == Card::red_card) // no problem (bad)
cout <...
How to do constructor chaining in C#
... {
}
}
then:
Foo a = new Foo(), b = new Foo(456,"def"), c = new Foo(123), d = new Foo("abc");
Note also:
you can chain to constructors on the base-type using base(...)
you can put extra code into each constructor
the default (if you don't specify anything) is base()
For "why?":
code r...
How to convert a data frame column to numeric type?
... you want to convert to numeric. I suggest that you should apply transform function in order to complete your task.
Now I'm about to demonstrate certain "conversion anomaly":
# create dummy data.frame
d <- data.frame(char = letters[1:5],
fake_char = as.character(1:5),
...
How to get index using LINQ? [duplicate]
...
@kape123: This certainly also can be used for Dictionary and Hashset. Obviously the index returned isn't as "well defined" as an index in an ordered collection, but it can still be used with ElementAt to retrieve the matched eleme...
MetadataException: Unable to load the specified metadata resource
...
Craig StuntzCraig Stuntz
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How do I invoke a Java method when given the method name as a string?
...
123
Not a fair -1. Henrik is probably not advocating squashing exceptions and didn't write anything for them because he is just trying to demo...
How can I remove a specific item from an array?
...ages (a lot of them older than JavaScript.)
– default123
Sep 10 at 0:16
...
Use of .apply() with 'new' operator. Is this possible?
...nswered Jan 12 '12 at 22:20
user123444555621user123444555621
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