Tutorial by Examples: a

In this very first example, a basic serial write operation is started from an Arduino device. void setup() { // put your setup code here, to run once: Serial.begin(9600); } void loop() { // put your main code here, to run repeatedly: Serial.println("Hello World!"); dela...

/** *@NApiVersion 2.x *@NScriptType Suitelet */ define([],function() { // NetSuite's AMD pattern function onRequest_entry(context) { // Suitelet entry function receives a context obj context.response.write('Hello World'); // Write a response using the context obj } retu...

.after(delay, callback=None) is a method defined for all tkinter widgets. This method simply calls the function callback after the given delay in ms. If no function is given, it acts similar to time.sleep (but in milliseconds instead of seconds) Here is an example of how to create a simple timer us...

If you want to append a series of values [1,2] to the column of dataframe df, you will get NaNs: import pandas as pd series=pd.Series([1,2]) df=pd.DataFrame(index=[3,4]) df['col']=series df col 3 NaN 4 NaN because setting a new column automatically aligns the data by the inde...

The latest JVMs supports Garbage First GC ( G1 GC) and consists of set of regions which accumulate to make young and old generation. The JVM will have approximately 2048 reagions and set heap region size accordingly from 1 MB to 32 MB and power of 2 bounds. This is important parameter which decide ...

COMPUTE answer = 3*var-1 That is a reference to the variable var-1, and not var - 1. COMPUTE answer = 3 * var - 1 Recommended, opinion.

Luminus is a Clojure micro-framework based on a set of lightweight libraries. It aims to provide a robust, scalable, and easy to use platform. With Luminus you can focus on developing your app the way you want without any distractions. It also has very good documentation that covers some of the majo...

The simplest composite type is an immutable type. Instances of immutable types, like tuples, are values. Their fields cannot be changed after they are created. In many ways, an immutable type is like a Tuple with names for the type itself and for each field. Singleton types Composite types, by def...

Scenario: You need to select an implementation of address validation when a sales order is submitted, and the validator is determined by the country to which the order is shipping. The factory needs to inspect some value passed as an argument to select the correct implementation. First, write an in...

Scenario: You need to resolve a dependency when a method is called, not in the constructor. Solution: Inject an abstract factory into the constructor. When the method is called, it requests the dependency from the abstract factory, which in turn resolves it from the container. (Your class depends o...

const Promise = require('bluebird'), fs = require('fs') Promise.promisifyAll(fs) // now you can use promise based methods on 'fs' with the Async suffix fs.readFileAsync('file.txt').then(contents => { console.log(contents) }).catch(err => { console.error('error reading', er...

Example of map: Promise.resolve([ 1, 2, 3 ]).map(el => { return Promise.resolve(el * el) // return some async operation in real world }) Example of filter: Promise.resolve([ 1, 2, 3 ]).filter(el => { return Promise.resolve(el % 2 === 0) // return some async operation in real world...

This example shows the simplest usage of the Image component to display an image. The Image source property is a url type that can be either a file with an absolute or relative path, an internet URL (http://) or a Qt resource (qrc:/) import QtQuick 2.3 Rectangle { width: 640 height: 4...

const promiseReturningFunction = Promise.coroutine(function* (file) { const data = yield fs.readFileAsync(file) // this returns a Promise and resolves to the file contents return data.toString().toUpperCase() }) promiseReturningFunction('file.txt').then(console.log)

function somethingThatReturnsADisposableResource() { return getSomeResourceAsync(...).disposer(resource => { resource.dispose() }) } Promise.using(somethingThatReturnsADisposableResource(), resource => { // use the resource here, the disposer will automatically close it when ...

const Koa = require('koa') const app = new Koa() app.use(async ctx => { ctx.body = 'Hello World' }) app.listen(8080)

app.use(async (ctx, next) => { try { await next() // attempt to invoke the next middleware downstream } catch (err) { handleError(err, ctx) // define your own error handling function } })

describe('Suite Name', function() { describe('#method()', function() { it('should run without an error', function() { expect([ 1, 2, 3 ].length).to.be.equal(3) }) }) })

var expect = require("chai").expect; describe('Suite Name', function() { describe('#method()', function() { it('should run without an error', function(done) { testSomething(err => { expect(err).to.not.be.equal(null) done() }) }) }) }) ...

describe('Suite Name', function() { describe('#method()', function() { it('should run without an error', function() { return doSomething().then(result => { expect(result).to.be.equal('hello world') }) }) }) })