Tutorial by Examples: me

Dim duplicateFruits = New List(Of String) From {"Grape", "Apple", "Grape", "Apple", "Grape"} 'At this point, duplicateFruits.Length = 5 Dim uniqueFruits = duplicateFruits.Distinct(); 'Now, uniqueFruits.Count() = 2 'If iterated over at this poin...

When one with typeof operator one gets type object it falls into somewhat wast category... In practice you might need to narrow it down to what sort of 'object' it actually is and one way to do it is to use object constructor name to get what flavour of object it actually is: Object.prototype.toSt...

var a = 11, b = 22; a = a ^ b; b = a ^ b; a = a ^ b; console.log("a = " + a + "; b = " + b);// a is now 22 and b is now 11

<iframe "id="iframe_Login1"> <iframe "id="iframe_Login2"> <iframe "id="iframe_Login3"> </iframe> </iframe> </iframe> To switch into frame in selenium use swithTo() and frame()...

Here we are having a list of todo items that is passed to the props of our component. Each todo item has a text and id property. Imagine that the id property comes from a backend datastore and is a unique numeric value: todos = [ { id: 1, text: 'value 1' }, { id: 2, te...

This is especially useful if we have a class that we want to extend in the rule. See example below for a more convenient method. import org.junit.rules.TestRule; import org.junit.runners.model.Statement; public class AwesomeTestRule implements TextRule { @Override public Stateme...

class Hello < Hyperloop::Component # params (= react props) are declared using the param macro param :guest render do "Hello there #{params.guest}" end end # to "mount" Hello with guest = "Matz" say Hello(guest: 'Matz') # params can be giv...

To find your existing .cs files, right click on the project in your instance of Visual Studio, and click Open Folder in File Explorer. Visual Studio --> Your current project (Windows Form) --> Solution Explorer --> Project Name --> Right Click --> Add --> Existing Item --> ...

The TestProducerfrom this example produces Integerobjects in a given range and pushes them to its Subscriber. It extends the Flowable<Integer> class. For a new subscriber, it creates a Subscription object whose request(long) method is used to create and publish the Integer values. It is impor...

To fetch large data we can use generators in pandas and load data in chunks. import pandas as pd from sqlalchemy import create_engine from sqlalchemy.engine.url import URL # sqlalchemy engine engine = create_engine(URL( drivername="mysql" username="user", ...

import * as React from 'react'; import * as ReactDOM from 'react-dom'; import { Route, BrowserRouter as Router, Link, match } from 'react-router-dom'; // define React components for multiple pages class Home extends React.Component<any, any> { render() { return ( <div&g...

This solution is more involved, leveraging custom TypeScript decorators which inject match, history and/or location data into your React.Component class, which gets you full type safety without needing any type guards, as the previous example required. // Routed.ts - defines decorators import { Ro...

A for loop iterate through items in an enumeration program EnumLoop; uses TypInfo; type TWeekdays = (Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday); var wd : TWeekdays; begin for wd in TWeekdays do WriteLn(GetEnumName(TypeInfo(TWeekdays), Ord(wd))); ...

Consider the array declared as real x(10) Then we have three aspects of interest: The whole array x; Array elements, like x(1); Array sections, like x(2:6). Whole arrays In most cases the whole array x refers to all of the elements of the array as a single entity. It may appear in exec...

# install sbt with homebrew (if you didn't) brew install sbt # - create a new scala project # - name your project name when asked like: hello-world sbt new sbt/scala-seed.g8 # go to the new project directory that you named cd hello-world # run sbt to open the sbt shell sbt # run you...

this will accept any type with a method named GetLength that takes nothing and returns an int: ((^a : (static member GetLength : int) ()))

How can I print hello world 5 times? 5.times{ println "hello world" }

Table/Column Names Two common ways of formatting table/column names are CamelCase and snake_case: SELECT FirstName, LastName FROM Employees WHERE Salary > 500; SELECT first_name, last_name FROM employees WHERE salary > 500; Names should describe what is stored in their object. Th...

if len(sys.argv) != 4: # The script name needs to be accounted for as well. raise RuntimeError("expected 3 command line arguments") f = open(sys.argv[1], 'rb') # Use first command line argument. start_line = int(sys.argv[2]) # All arguments come as strings, so need to ...

# The name of the executed script is at the beginning of the argv list. print('usage:', sys.argv[0], '<filename> <start> <end>') # You can use it to generate the path prefix of the executed program # (as opposed to the current module) to access files relative to that, # which...