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How to 'minify' Javascript code
...=(a+1).toString()
}
var i=new Array;
return i[0]=e,i[1]=t,i
}
But are all those vars , ifs, loops & definitions necessary?
Most of the time NO !
Remove unnecessary if,loop,var
Keep a copy of your original code
Use the minifier
OPTIONAL (increases the performance & shorter code)
u...
How does one reorder columns in a data frame?
...s keep all the rows, and the 1,2,3,4 refers to the columns.
To change the order as in the above question do df2[,c(1,3,2,4)]
If you want to output this file as a csv, do write.csv(df2, file="somedf.csv")
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Bootstrap Carousel image doesn't align properly
...sive center-block" src="img/....jpg" alt="First slide">
This automatically does image resizing, and centers the picture.
Edit:
With bootstrap 4, just add the img-fluid class
<img class="img-fluid" src="img/....jpg">
...
@OneToMany List vs Set difference
... column specified, will just be handled as a bag by Hibernate (no specific ordering).
One notable difference in the handling of Hibernate is that you can't fetch two different lists in a single query. For example, if you have a Person entity having a list of contacts and a list of addresses, you w...
Change Name of Import in Java, or import two classes with the same name
...
In PHP it's : use com\example\Calendar as MyCalendar
– matang
Jan 31 '17 at 6:41
22
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How to get primary key column in Oracle?
...ND cons.constraint_name = cols.constraint_name
AND cons.owner = cols.owner
ORDER BY cols.table_name, cols.position;
Make sure that 'TABLE_NAME' is in upper case since Oracle stores table names in upper case.
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How to put an image in div with CSS?
I would like to have all my images in CSS (the only way I know how is to put them in as background images).
4 Answers
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Object.getOwnPropertyNames vs Object.keys
... least with nodejs) "getOwnPropertyNames" function does not guarantee keys order, that's why I usually use "keys" function :
Object.keys(o).forEach(function(k) {
if (!o.propertyIsEnumerable(k)) return;
// do something...
});
...
When/Why to use Cascading in SQL Server?
...onship can involve an exclusive "is part of" description. For example, an OrderLine record is part of its parent order, and OrderLines will never be shared between multiple orders. If the Order were to vanish, the OrderLine should as well, and a line without an Order would be a problem.
The canonic...
How to sort an array based on the length of each element?
... elements that compare
equal do not necessarily remain in their original order).
If the objective is to sort by length then by dictionary order you must specify additional criteria:
["c", "a", "b"].sort(function(a, b) {
return a.length - b.length || // sort by length, if equal then
a...