You can define a method to accept an arbitrary number of keyword arguments using the double splat (**) operator:
def say(**args)
puts args
end
say foo: "1", bar: "2"
# {:foo=>"1", :bar=>"2"}
The arguments are captured in a Hash. You can manip...
Using Alternatives
Many Linux distributions use the alternatives command for switching between different versions of a command. You can use this for switching between different versions of Java installed on a machine.
In a command shell, set $JDK to the pathname of a newly installed JDK; e.g....
Given a DataFrame with MultiIndex columns
# build an example DataFrame
midx = pd.MultiIndex(levels=[['zero', 'one'], ['x','y']], labels=[[1,1,0,],[1,0,1,]])
df = pd.DataFrame(np.random.randn(2,3), columns=midx)
In [2]: df
Out[2]:
one zero
y x ...
Start with a standard DataFrame
df = pd.DataFrame(np.random.randn(2,3), columns=['a','b','c'])
In [91]: df
Out[91]:
a b c
0 -0.911752 -1.405419 -0.978419
1 0.603888 -1.187064 -0.035883
Now to change to MultiIndex, create a MultiIndex object and assign it to df....
There are many ways to print the classical "Hello world!" message in VHDL. The simplest of all is probably something like:
-- File hello_world.vhd
entity hello_world is
end entity hello_world;
architecture arc of hello_world is
begin
assert false report "Hello world!&quo...
To enable code shrinking with ProGuard, add minifyEnabled true to the appropriate build type in your build.gradle file.
android {
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile(‘proguard-android.txt'),
'pro...
R provides two additional looping constructs, while and repeat, which are typically used in situations where the number of iterations required is indeterminate.
The while loop
The general form of a while loop is as follows,
while (condition) {
## do something
## in loop body
}
whe...
First, let's see three different ways of extracting data from a file.
string fileText = File.ReadAllText(file);
string[] fileLines = File.ReadAllLines(file);
byte[] fileBytes = File.ReadAllBytes(file);
On the first line, we read all the data in the file as a string.
On the second line, we r...
All modern JavaScript JIT compilers trying to optimize code based on expected object structures. Some tip from mdn.
Fortunately, the objects and properties are often "predictable", and in
such cases their underlying structure can also be predictable. JITs
can rely on this to make pred...
When throw occurs in an expression with an operand, its effect is to throw an exception, which is a copy of the operand.
void print_asterisks(int count) {
if (count < 0) {
throw std::invalid_argument("count cannot be negative!");
}
while (count--) { putchar(...
First, add the HTML File to your Project (If you are asked to choose options for adding the file, select Copy items if needed)
The following line of code loads the content of the HTML file into the webView
webView.loadRequest(NSURLRequest(URL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForRe...
Suppose we have a component which will hide at a certain window width.
import { Component } from '@angular/core';
@Component({
...
template: `
<div>
<p [hidden]="!visible" (window:resize)="onResize($event)" >Now you see me...</p>
<...
Step 1: Create events.xml file according to your requirement in frontend, Backend, or both YKM/Banner/etc/frontend/events.xml
<?xml version="1.0" encoding="UTF-8"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation=&q...
CREATE TYPE MyUniqueNamesType as TABLE
(
FirstName varchar(10),
LastName varchar(10),
UNIQUE (FirstName,LastName)
)
Note: constraints in user defined table types can not be named.
#include <gtk/gtk.h>
// callback function which is called when button is clicked
static void on_button_clicked(GtkButton *btn, gpointer data) {
// change button label when it's clicked
gtk_button_set_label(btn, "Hello World");
}
// callback function which is called ...
Perl interpolates variable names:
my $name = 'Paul';
print "Hello, $name!\n"; # Hello, Paul!
my @char = ('a', 'b', 'c');
print "$char[1]\n"; # b
my %map = (a => 125, b => 1080, c => 11);
print "$map{a}\n"; # 125
Arrays may be interpolated as a whol...
