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Couldn't connect to server 127.0.0.1:27017
...cause the mongod process it's down, you must to run the commands bellow in order to get up the mongod process:
~$ sudo service mongodb stop
~$ sudo rm /var/lib/mongodb/mongod.lock
~$ sudo mongod --repair --dbpath /var/lib/mongodb
~$ sudo mongod --fork --logpath /var/lib/mongodb/mongodb.log --dbp...
How does Zalgo text work?
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How to do case insensitive string comparison?
...y to do it (if you're not worried about special Unicode characters) is to call toUpperCase:
var areEqual = string1.toUpperCase() === string2.toUpperCase();
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Determine the number of NA values in a column
...nt the number of NA values in a data frame column. Say my data frame is called df , and the name of the column I am considering is col . The way I have come up with is following:
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What is an optional value in Swift?
...g and writing code more fluent. Unfortunately this obscures the way it actually works. I'll go through some of the tricks later.
Note: I'll be talking about optional variables a lot, but it's fine to create optional constants too. I mark all variables with their type to make it easier to understand ...
Easier way to create circle div than using an image?
... image is not circular..which is in mozilla.
– techie_28
Jan 6 '12 at 15:19
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@techie_28: The div...
How to set Default Controller in asp.net MVC 4 & MVC 5
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How to implement the Java comparable interface?
...mplementation of compareTo, animals with a higher year_discovered will get ordered higher. I hope you get the idea of Comparable and compareTo with this example.
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How Pony (ORM) does its tricks?
...ecode instructions one-by-one.
For each instruction the decompiler object calls its own method.
The name of this method is equal to the name of current bytecode instruction.
When Python calculates an expression, it uses stack, which stores an intermediate
result of calculation. The decompiler objec...
Compiler Ambiguous invocation error - anonymous method and method group with Func or Action
...esolution to take return type into account for method group conversions in order to make the behaviour more intuitive, but I do understand it would do so at the cost of consistency. (The same can be said of generic type inference as applied to method group conversions when there's only one method in...