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Load and execute external js file in node.js with access to local variables?
... scope.
Instead the suggest method is to export your functions/variables.
If you want the MVC pattern take a look at Geddy.
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instanceof Vs getClass( )
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The reason that the performance of instanceof and getClass() == ... is different is that they are doing different things.
instanceof tests whether the object reference on the left-hand side (LHS) is an instance of the type on the right-hand side (RHS) or some subtype.
getClass() == ... tests wh...
Change type of varchar field to integer: “cannot be cast automatically to type integer”
...ting integer or assign a varchar field to an integer one), so you must specify an explicit cast using ALTER TABLE ... ALTER COLUMN ... TYPE ... USING:
ALTER TABLE the_table ALTER COLUMN col_name TYPE integer USING (col_name::integer);
Note that you may have whitespace in your text fields; in that...
Case insensitive comparison of strings in shell script
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if you have bash
str1="MATCH"
str2="match"
shopt -s nocasematch
case "$str1" in
$str2 ) echo "match";;
*) echo "no match";;
esac
otherwise, you should tell us what shell you are using.
alternative, using awk
str1="MATC...
What is a stream?
...skip bytes from the stream (this is like read, but you ignore the data. Or if you prefer it's like seek but can only go forwards.)
push back bytes into an input stream (this is like "undo" for read - you shove a few bytes back up the stream, so that next time you read that's what you'll see. It's oc...
Delete everything in a MongoDB database
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Use with caution: if you're in a sharded environment using wiredTiger and you have no user database and you invoke dropDatabase, the database will be deleted and could re-appear as primary on a different shard when new records are added.
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How to determine when a Git branch was created?
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Use
git show --summary `git merge-base foo master`
If you’d rather see it in context using gitk, then use
gitk --all --select-commit=`git merge-base foo master`
(where foo is the name of the branch you are looking for.)
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What is the difference between packaged_task and async
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Actually the example you just gave shows the differences if you use a rather long function, such as
//! sleeps for one second and returns 1
auto sleep = [](){
std::this_thread::sleep_for(std::chrono::seconds(1));
return 1;
};
Packaged task
A packaged_task won...
How can I repeat a character in Bash?
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If you functionalise this it's best to rearrange it from $s%.0s to %.0s$s otherwise dashes cause a printf error.
– KomodoDave
Jul 30 '14 at 7:35
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Why does Dijkstra's algorithm use decrease-key?
...ends on what priority queue you use. Here's a quick table that shows off different priority queues and the overall runtimes of the different Dijkstra's algorithm implementations:
Queue | T_e | T_d | T_k | w/o Dec-Key | w/Dec-Key
---------------+--------+--------+--------+------...