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Random record in ActiveRecord
... Model.pluck(:id)
random_model = Model.find(ids.sample)
pluck returns an array of all the id's in the table. The sample method on the array, returns a random id from the array.
This should perform well, with equal probability of selection and support for tables with deleted rows. You can even mix...
Try-catch speeding up my code?
... why the C# compiler generates so many extraneous locals. For example, new array initialisation expressions always generate a local, but is never necessary to generate a local. If it allows the JITter to produce measurably more performant code, perhaps the C# compiler should be a bit more careful ab...
How do CSS triangles work?
...ss="border"></div>
Random version
/**
* Randomize array element order in-place.
* Using Durstenfeld shuffle algorithm.
*/
function shuffleArray(array) {
for (var i = array.length - 1; i > 0; i--) {
var j = Math.floor(Math.random()
Pass Multiple Parameters to jQuery ajax call
...
or you can use an array to pass data in jason.stringyfy(array).
– Shekhar Patel
Aug 26 '16 at 12:45
add a comment
...
How can I use threading in Python?
...Pool as ThreadPool
pool = ThreadPool(4)
results = pool.map(my_function, my_array)
Which is the multithreaded version of:
results = []
for item in my_array:
results.append(my_function(item))
Description
Map is a cool little function, and the key to easily injecting parallelism into your Pytho...
Javascript - How to extract filename from a file input control
...it(/(\\|\/)/g).pop()
"The pop method removes the last element from an array and returns that
value to the caller."
Mozilla Developer Network
Example:
from: "/home/user/file.txt".split(/(\\|\/)/g).pop()
you get: "file.txt"
...
Spring Test & Security: How to mock authentication?
...password");
UserActive basicActiveUser = new UserActive(basicUser, Arrays.asList(
new SimpleGrantedAuthority("ROLE_USER"),
new SimpleGrantedAuthority("PERM_FOO_READ")
));
User managerUser = new UserImpl("Manager User", "manager@company.com", "...
Do interfaces inherit from Object class in java
...
"Reference types all inherit from java.lang.Object. Classes, enums, arrays, and interfaces are all reference types."
Quoted from: http://docs.oracle.com/javase/tutorial/reflect/class/index.html
Second sentence to be clear.
...
How to: Define theme (style) item for custom widget
...efStyle ) {
super( context, attrs, defStyle );
final TypedArray array = context.obtainStyledAttributes( attrs,
R.styleable.CustomImageButton, defStyle,
R.style.Widget_ImageButton_Custom ); // see below
this.customAttr =
array.getString( R....
Remove first element from $@ in bash [duplicate]
...
Another variation uses array slicing:
for item in "${@:2}"
do
process "$item"
done
This might be useful if, for some reason, you wanted to leave the arguments in place since shift is destructive.
...