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Postgres and Indexes on Foreign Keys and Primary Keys
...y_cols )
ORDER BY fkoid, attnum
),
fk_cols_list AS (
SELECT fkoid, array_agg(attname) as cols_list
FROM fk_attributes
GROUP BY fkoid
),
index_list AS (
SELECT indexrelid as indexid,
pg_class.relname as indexname,
indrelid,
indkey,
indpred is not nu...
Queries vs. Filters
...store the binary true/false match per document , something called a bitSet Array is used.
This BitSet array is in memory and this would be used from second time the filter is queried. This way , using bitset array data-structure , we are able to utilize the cached result.
One more point to note he...
Why avoid increment (“++”) and decrement (“--”) operators in JavaScript?
...ew is to always use ++ and -- by themselves on a single line, as in:
i++;
array[i] = foo;
instead of
array[++i] = foo;
Anything beyond that can be confusing to some programmers and is just not worth it in my view. For loops are an exception, as the use of the increment operator is idiomatic a...
Insert a string at a specific index
... way, your notion of not modifying "objects you don't know" would preclude Array mutation methods. You saying you'd rather do my_array[my_array.length] = item instead of my_array.push(item)?
– user1106925
Sep 17 '16 at 16:08
...
What does this symbol mean in JavaScript?
...aScript?
Delegated yield (yield star, yield *) in generator functions
[], Array() — Square brackets: array notation
What’s the difference between "Array()" and "[]" while declaring a JavaScript array?
What is array literal notation in javascript and when should you use it?
{key: value} ...
Get the value of an instance variable given its name
...tual object. I ended up rewriting so instead of having many variables + an array with the names in the order I wanted, I put the parameters themselves into the array (the design decision was whether to access variables each time by searching the array or optimize by having an additional array with t...
How to parse JSON in Scala using standard Scala classes?
...Any]] =
"{" ~> repsep(member, ",") <~ "}" ^^ (Map() ++ _)
def array: Parser[List[Any]] =
"[" ~> repsep(value, ",") <~ "]"
def member: Parser[(String, Any)] =
stringLiteral ~ ":" ~ value ^^ { case name ~ ":" ~ value => (name, value) }
def value: Parser[Any] = (
...
How does collections.defaultdict work?
...llections import defaultdict
# Time complexity O(n^2)
def delete_nth_naive(array, n):
ans = []
for num in array:
if ans.count(num) < n:
ans.append(num)
return ans
# Time Complexity O(n), using hash tables.
def delete_nth(array,n):
result = []
counts = defa...
How to print out all the elements of a List in Java?
...c static void main(String[] args) {
List<Model> models = new ArrayList<>();
// TODO: First create your model and add to models ArrayList, to prevent NullPointerException for trying this example
// Print the name from the list....
for(Model model : models...
How to detect if a script is being sourced
...
If your Bash version knows about the BASH_SOURCE array variable, try something like:
# man bash | less -p BASH_SOURCE
#[[ ${BASH_VERSINFO[0]} -le 2 ]] && echo 'No BASH_SOURCE array variable' && exit 1
[[ "${BASH_SOURCE[0]}" != "${0}" ]] && echo "sc...