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Why are dates calculated from January 1st, 1970?
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Do you know if Kernighan and Thompson every expressed a reason for choosing that moment beyond "It's a round number slightly before we started building the thing."?
– dmckee --- ex-moderator kitten
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Regular vs Context Free Grammars
...copies of y.) You basically have one "nonterminal" that can be expanded.
Now, what about context-free languages? There's an analogous pumping lemma for context-free languages that breaks the strings in the language into five parts, uvxyz, and where all instances of the language are in uvixyiz, fo...
How to open standard Google Map application from my application?
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For directions, a navigation intent is now supported with google.navigation:q=latitude,longitude: Uri gmmIntentUri = Uri.parse("google.navigation:q=" + 12f " +"," + 2f); Intent mapIntent = new Intent(Intent.ACTION_VIEW, gmmIntentUri); mapIntent.setPackage("com.g...
Why is using “for…in” for array iteration a bad idea?
...mewhere deep in your JavaScript library...
Array.prototype.foo = 1;
// Now you have no idea what the below code will do.
var a = [1, 2, 3, 4, 5];
for (var x in a){
// Now foo is a part of EVERY array and
// will show up here as a value of 'x'.
console.log(x);
}
/* Will disp...
Web workers without a separate Javascript file?
... Google Chrome only solution, seems Firefox 10 will support it, i don't know about other browsers
– 4esn0k
Dec 1 '11 at 13:07
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Swift native base class or NSObject
...hich extent runtime introspection will be added to the language, I do not know. Method interception will likely become only possible if the method explicitly allows it. This is my guess, but only the language designers within Apple really know where they are really heading.
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How to write DataFrame to postgres table?
...s 0.14 (released end of May 2014), postgresql is supported. The sql module now uses sqlalchemy to support different database flavors. You can pass a sqlalchemy engine for a postgresql database (see docs). E.g.:
from sqlalchemy import create_engine
engine = create_engine('postgresql://scott:tiger@lo...
What is the difference between varchar and nvarchar?
... and Unicode is the cure for codepage problems. With cheap disk and memory nowadays, there is really no reason to waste time mucking around with code pages anymore.
All modern operating systems and development platforms use Unicode internally. By using nvarchar rather than varchar, you can avoid do...
advantage of tap method in ruby
...iately clear. A reader would not have to read what is inside the block to know that an instance user is created.
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How to correctly display .csv files within Excel 2013?
...itor like Notepad++ and add the following text in the first line:
sep=,
Now open it with excel again.
This will set the separator as a comma, or you can change it to whatever you need.
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