Tutorial by Examples: if

Using else we can perform some task when the condition is not satisfied. But what if we want to check a second condition in case that the first one was false. We can do it this way: a = 9; if mod(a,2)==0 % MOD - modulo operation, return the remainder after division of 'a' by 2 disp('a is ev...

To check if a required gem is installed, from within your code, you can use the following (using nokogiri as an example): begin found_gem = Gem::Specification.find_by_name('nokogiri') require 'nokogiri' .... <the rest of your code> rescue Gem::LoadError end However, this can ...

In this example, a model will learn to classify fruits given certain features, using the Labels for training. WeightColorLabel0.5greenapple0.6purpleplum3greenwatermelon0.1redcherry0.5redapple Here the a model will take Weight and Color as features to predict the Label. For instance [0.15, 'red'] s...

This query will return all columns from the table sales where the values in the column amount is greater than 10 and the data in the region column in "US". SELECT * FROM sales WHERE amount > 10 AND region = "US" You can use regular expressions to select the columns you wan...

class ClassWithAReallyLongName { public: class Iterator { /* ... */ }; Iterator end(); }; Defining the member end with a trailing return type: auto ClassWithAReallyLongName::end() -> Iterator { return Iterator(); } Defining the member end without a trailing return type: Clas...

Sometimes specific instances of data should be used. Recreation is not desired and referencing static data would have a code smell. It is possible to specify a XmlAdapter instance the Unmarshaller should use, which allows the user to use XmlAdapters with no zero-arg constructor and/or pass data to ...

import std.stdio; bool isPrime(int number) { foreach(i; 2..number) { if (number % i == 0) { return false; } } return true; } void main() { writeln(2.isPrime); writeln(3.isPrime); writeln(4.isPrime); 5.isPrime.writeln; } ...

In order to obtain a Google Maps API key for your certificate, you must provide the API console with the SH1-fingerprint of your debug/release keystore. You can obtain the keystore by using the JDK's keytool program as described here in the docs. Another approach is to obtain the fingerprint progr...

It is perfectly fine to use a package name other than the folder name. If we do so, we still have to import the package based on the directory structure, but after the import we have to refer to it by the name we used in the package clause. For example, if you have a folder $GOPATH/src/mypck, and i...

--- person_table: - &person001 fname: homer lname: simpson role: dad age: 33 - &person002 fname: marge lname: simpson role: mom age: 34 - &person003 fname: pe...

In Scala (in contrast to Java and most other languages), if is an expression instead of a statement. Regardless, the syntax is identical: if(x < 1984) { println("Good times") } else if(x == 1984) { println("The Orwellian Future begins") } else { println("Po...

Interfaces and implementations (types that implement an interface) are "detached". So it is a rightful question how to check at compile-time if a type implements an interface. One way to ask the compiler to check that the type T implements the interface I is by attempting an assignment us...

public void ConfigureServices(IServiceCollection services) { services.AddMvc(); services.AddCors(); services.ConfigureCors(options => options.AddPolicy("AllowSpecific", p => p.WithOrigins("http://localhost:1233") ...

Title This band is showed once at the beginning of the report. It can be used as first page by setting the attribute isTitleNewPage="true" Page Header This appears at the beginning of each page excluding first page if Title band is used and last page if Summary band is used with setting...

Sometimes the default Scrapy user agent ("Scrapy/VERSION (+http://scrapy.org)") is blocked by the host. To change the default user agent open settings.py, uncomment and edit the following line to what ever you want. #USER_AGENT = 'projectName (+http://www.yourdomain.com)' For example ...

The METEOR_SETTINGS environment variable can accept JSON objects, and will expose that object in the Meteor.settings object. First, add a settings.json to your app root with some configuration info. { "public":{ "ga":{ "account":"UA-XXXXXXX-1" ...

A release manifest is similar to an NPM package.json file, in that it's primary concern is specify a list of Atmosphere packages, and providing a bit of metadata about that list of packages. The basic format looks like this: { "track":"distroname:METEOR", "version&qu...

StarryNight contains a small utility that parses an application's .meteor/versions file, and converts it into a Release Manifest. npm install -g starrynight cd myapp starrynight generate-release-json If you don't wish to use StarryNight, simply copy the contents of your .meteor/versions file i...

meteor show --ejson [email protected]

Uniform grid will place all it's children in a grid layout, each child in it's own cell. All the cells will have the same size. It can be thought to be a shorthand to a grid where all the row and column definitions are set to * Default rows and columns By default the UniformGrid will try to crea...