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Why use Ruby instead of Smalltalk? [closed]
... was large and had reputation for a fairly steep learning curve. Most key functionality in Smalltalk is hidden away somewhere in the class library, even basic stuff like streams and collections. The language paradigm is also something of a culture shock for someone not familiar with it, and the pi...
Why doesn't String switch statement support a null case?
... Paul BelloraPaul Bellora
50.4k1717 gold badges123123 silver badges173173 bronze badges
1
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How to format time since xxx e.g. “4 minutes ago” similar to Stack Exchange sites
...
123
Might be an overkill in this case, but if the opportunity shows moment.js is just awesome!
Mo...
How do I do a case-insensitive string comparison?
...NFKD", "ê")
#>>> True
To finish up, here this is expressed in functions:
import unicodedata
def normalize_caseless(text):
return unicodedata.normalize("NFKD", text.casefold())
def caseless_equal(left, right):
return normalize_caseless(left) == normalize_caseless(right)
...
How to efficiently build a tree from a flat structure?
...
123
Store IDs of the objects in a hash table mapping to the specific object. Enumerate through all...
What is the difference between 'my' and 'our' in Perl?
...ariables. You can see that in the following program: package Foo; our $x = 123; package Bar; say $x;. If you want to "declare" a package variable, you need to use use vars qw( $x );. our $x; declares a lexically-scoped variable that is aliased to the same-named variable in the package in which the o...
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****"
...
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 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 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...