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What is the benefit of using $() instead of backticks in shell scripts?
...gnments. x=$(f); x=`f` behave the same as x="$(f)"; x="`f`". In contrast, array assignment x=($(f)); x=(`f`) do perform splitting at $IFS characters as expected when invoking commands. This is convenient (x=1 2 3 4 doesn't make sense) but inconsistent.
– kdb
S...
How do I create a list of random numbers without duplicates?
...ted.
If you want a list of numbers from 1 to N in a random order, fill an array with integers from 1 to N, and then use a Fisher-Yates shuffle or Python's random.shuffle().
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What is the difference between pluck and collect in Rails?
...cording to Rails guides, pluck directly converts a database result into an array, without constructing ActiveRecord objects. This means better performance for a large or often-running query.
In addition to @apneadiving's answer, pluck can take both single and multiple column names as argument:
Cli...
Accessing the index in 'for' loops?
...
I am sending data using ajax to Django views as an array in the form of two values in a variable legData with values as [1406, 1409]. If I print to the console using print(legData), the output is [1406,1409]. However, if I try to parse the individual values of the list like ...
Check a collection size with JSTL
...ts:
${empty companies}
This checks for null and empty lists/collections/arrays. It doesn't get you the length but it satisfies the example in the OP. If you can get away with it this is just cleaner than importing a tag library and its crusty syntax like gt.
...
Exception thrown in NSOrderedSet generated accessors
... I am getting this error when I try to implement this work-around.. [__NSArrayI isEqualToSet:]: unrecognized selector sent to instance... This usually is from a item that has been release, but can't find where, anyone run into this?
– DerekH
Jan 19 '12 at 15:...
In C++, if throw is an expression, what is its type?
...erand has type (possibly cv-qualified) void, then the lvalue-to-rvalue,
array-to-pointer, and function-to-pointer standard conversions are performed on the second and
third operands, and one of the following shall hold:
— The second or the third operand (but not both) is a throw-expressi...
How to generate a random int in C?
...s not safe to use */
return 1;
}
/* myString will be an array of 32 random bytes, not null-terminated */
randombytes_buf(myString, 32);
/* myInt will be a random number between 0 and 9 */
myInt = randombytes_uniform(10);
}
randombytes_uniform() is cryptograp...
How do you format the day of the month to say “11th”, “21st” or “23rd” (ordinal indicator)?
...cell 0 is wasted)
String[] ordinalIndicators = new String[31 + 1];
Arrays.fill(ordinalIndicators, 1, ordinalIndicators.length, "th");
ordinalIndicators[1] = ordinalIndicators[21] = ordinalIndicators[31] = "st";
ordinalIndicators[2] = ordinalIndicators[22] = "nd";
ordinalIndicator...
Extracting substrings in Go
...
To get substring
find position of "sp"
cut string with array-logical
https://play.golang.org/p/0Redd_qiZM
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