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Can someone explain in simple terms to me what a directed acyclic graph is?
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How to Truncate a string in PHP to the word closest to a certain number of characters?
...hy article or a short sentence or two; but for this widget I can't display more than, say, 200 characters. I could use substr() to chop off the text at 200 chars, but the result would be cutting off in the middle of words-- what I really want is to chop the text at the end of the last word before...
SQL join: selecting the last records in a one-to-many relationship
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this solution works only, if there are more than 1 purchase records. ist there is 1:1 link, it does NOT work. there it has to be "WHERE (p2.id IS NULL or p1.id=p2.id)
– Bruno Jennrich
Jul 23 '17 at 19:22
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Why does this method print 4?
... get into main, the space left over is X-M. Each recursive call takes up R more memory. So for 1 recursive call (1 more than original), the memory use is M + R. Suppose that StackOverflowError is thrown after C successful recursive calls, that is, M + C * R <= X and M + C * (R + 1) > X. At the...
Interfaces vs. abstract classes [duplicate]
...ementations of methods
Added invariant checking to functions
Have slightly more control in how the "interface" methods are called
Ability to provide behavior related or unrelated to the interface for "free"
Interfaces are merely data passing contracts and do not have these features. However, they ...
Copying PostgreSQL database to another server
...s to copy from local to remote and the second one is from remote to local. More -> https://www.postgresql.org/docs/9.6/app-pgdump.html
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How to send an email with Python?
...t if you follow this approach, the "simple" task is indeed simple, and the more complex tasks (like attaching binary objects or sending plain/HTML multipart messages) are accomplished very rapidly.
# Import smtplib for the actual sending function
import smtplib
# Import the email modules we'll nee...
How can I scan barcodes on iOS?
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I believe more has been ported to C++, but the port is still a rough and outdated echo of the Java code unfortunately. So, yes more is supported though perhaps not well.
– Sean Owen
May 17 '11 at ...
How is Racket different from Scheme?
... [ ... ] as equivalent, R5RS does not, but R6RS does.
There are probably more, but on most other parts racket is a superset of Scheme.
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When should I use Arrow functions in ECMAScript 6?
...ken off quite a bit. ES6 will also ship a Promise object, which means even more anonymous functions. There is no going back for functional programming. In functional JavaScript, arrow functions are preferable over regular functions.
Take for instance this (particularly confusing) piece of code3:
f...