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What does the “Just” syntax mean in Haskell?
...r integer functions that are meant to return Natural numbers (for example, String.indexOf - when a substring is not found, the returned index is commonly designed to be negative)
return a special value (pointer): NULL or some such
silently return without doing anything: for example, lend could be wr...
How do I replace whitespaces with underscore?
I want to replace whitespace with underscore in a string to create nice URLs. So that for example:
13 Answers
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Django optional url parameters
...3 occurring. The URL paragraph will be MUCH harder to read than a single string with multiple optional parameters. Using symbolic constants for the optional parameter substrings would make it very easy to read, and there would be just one URL.
– Bogatyr
Sep...
ATL正则表达式库使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
... * szIN，是一个 const指针，这表明我们可以方便得使用std::string类的c_str()方法给其传递参数。
Match的结果通过第二个参数pContext所指向的CAtlREMatchContext<>类来返回，Match 的结果及其相关信息都被存放在CAtlREMatchContext类中，我们只要...
jQuery vs document.querySelectorAll
... of ID
if ( elem.id === match[3] ) {
return makeArray( [ elem ], extra );
}
} else {
return makeArray( [], extra );
}
And if all else fails it will return the result of oldSizzle(query, context, extra, seed).
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Convert a list of characters into a string
...
Use the join method of the empty string to join all of the strings together with the empty string in between, like so:
>>> a = ['a', 'b', 'c', 'd']
>>> ''.join(a)
'abcd'
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How to split a delimited string into an array in awk?
How to split the string when it contains pipe symbols | in it.
I want to split them to be in array.
9 Answers
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Build a Basic Python Iterator
...n (defines __getitem__)
Examples:
# generator
def uc_gen(text):
for char in text.upper():
yield char
# generator expression
def uc_genexp(text):
return (char for char in text.upper())
# iterator protocol
class uc_iter():
def __init__(self, text):
self.text = text.upp...
Convert string to binary in python
I am in need of a way to get the binary representation of a string in python. e.g.
8 Answers
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SQL - many-to-many table primary key
... index, on (col1, col2) also handles the 'both' case). The downside is the extra storage needed for the extra column. This is usually not significant, so the advice is far from awful. Nevertheless, if col1 and col2 are big or of very different sizes, you can save yourself some space without hurting ...