Tutorial by Examples: chai

Updating a Password in the Keychain

As usual, we first need a CFDictionary to represent the item we want to update. This must contain all of the old values for the item, including the old private data. Then it takes a CFDictionary of any attributes or the data itself that you would like to change. So first, let's construct a class ke...

iOS • Keychain

Removing a Password from the Keychain

We need only one thing in order to delete an item from the Keychain: a CFDictionary with attributes describing the items to be deleted. Any items that match the query dictionary will be deleted permanently, so if you are only intending to delete a single item be sure to be specific with your query. ...

iOS • Keychain

Keychain Add, Update, Remove and Find operations using one file.

Keychain.h #import <Foundation/Foundation.h> typedef void (^KeychainOperationBlock)(BOOL successfulOperation, NSData *data, OSStatus status); @interface Keychain : NSObject -(id) initWithService:(NSString *) service_ withGroup:(NSString*)group_; -(void)insertKey:(NSString *)key with...

iOS • Keychain

Chain-dereferencing

Just like in C, Rust raw pointers can point to other raw pointers (which in turn may point to further raw pointers). // Take a regular string slice let planet: &str = "Earth"; // Create a constant pointer pointing to our string slice let planet_ptr: *const &str = &planet ...

Rust • Raw Pointers

4. Chaining string manipulation methods together.

Dim exStr : exStr = " <Head>data</Head> " Dim res res = Ucase(Replace(Mid(exStr, instr(exStr, ">")+1,4), "ata", "ark")) 'res now equals DARK 'instr(exStr, ">") returns 7 'Mid(" <Head>data</Head> ", 7+1,...

vbscript • Strings

Chains

Since ConstraintLayout alpha 9, Chains are available. A Chain is a set of views inside a ConstraintLayout that are connected in a bi-directional way between them, i.e A connected to B with a constraint, and B connected to A with another constraint. Example: <android.support.constraint.Constrain...

Android • ConstraintLayout

chai-immutable plugin

Install from npm chai, chai-immutable, and ts-node npm install --save-dev chai chai-immutable ts-node Install types for mocha and chai npm install --save-dev @types/mocha @types/chai Write simple test file: import {List, Set} from 'immutable'; import * as chai from 'cha...

TypeScript • Unit Testing

Chainable route handlers for a route path by using app.route

var express = require('express'); var app = express(); var router = express.Router(); app.route('/user') .get(function (req, res) { res.send('Get a random user') }) .post(function (req, res) { res.send('Add a user') }) .put(function (req, res) { res.send...

express • Explain Routing in Express

State Transition Diagram of a Markov Chain

Suppose the following matrix is the transition probability matrix associated with a Markov chain. 0.5 0.2 0.3 P= 0.0 0.1 0.9 0.0 0.0 1.0 In order to study the nature of the states of a Markov chain, a state transition diagram of the Markov chain is drawn. \documentclass[12pt...

latex • Drawing graphs

Download an header chain with bitcore-p2p

IMPORTANT This is just an example code, do not use in production. In order to download an header chain we have to send a getHeaders message. In this example we will require as much as possible headers after the 40000th one.The peer will respond with batch of 2000 headers so, we have to take the la...

bitcoin • Thin Clients

Chain of responsibility

In object-oriented design, the chain-of-responsibility pattern is a design pattern consisting of a source of command objects and a series of processing objects. Each processing object contains logic that defines the types of command objects that it can handle; the rest are passed to the next proce...

Swift Language • Design Patterns - Creational

Chaining

This works, but there are a couple of things we need to do for our plugin to survive in the real world. One of jQuery's features is chaining, when you link five or six actions onto one selector. This is accomplished by having all jQuery object methods return the original jQuery object again (there a...

jquery-plugins • Getting started with jquery-plugins

logical chaining of commands with && and ||

&& chains two commands. The second one runs only if the first one exits with success. || chains two commands. But second one runs only if first one exits with failure. [ a = b ] && echo "yes" || echo "no" # if you want to run more commands within a logical c...

Bash • Chain of commands and operations

serial chaining of commands with semicolon

A semicolon separates just two commands. echo "i am first" ; echo "i am second" ; echo " i am third"

Bash • Chain of commands and operations

chaining commands with |

The | takes the output of the left command and pipes it as input the right command. Mind, that this is done in a subshell. Hence you cannot set values of vars of the calling process wihtin a pipe. find . -type f -a -iname '*.mp3' | \ while read filename; do mute --noise &quot...

Bash • Chain of commands and operations

Continuous deployment of RESTful API (Node.js) via GitHub using IBM Bluemix Toolchain

Step 1: Create your GitHub account If you already have a GitHub account, please proceed to Step 2. Otherwise, please follow below: 1.a Go to Github page. 1.b Enter your desired username, your email address and then your desired password. Afterwards, click the Sign up for GitHub button. Step 2:...

ibm-bluemix • Getting started with ibm-bluemix

Interceptors can be chained in a fixed order

For registration like this: var container = new WindsorContainer(); container.Register( Component.For<FirstInterceptor>(), Component.For<SecondInterceptor>(), Component.For<ThirdInterceptor>(), Component.For<IService>() .ImplementedBy<Servi...

castle-windsor • Interceptors

Keychain Access Control (TouchID with password fallback)

Keychain allows to save items with special SecAccessControl attribute which will allow to get item from Keychain only after user will be authenticated with Touch ID (or passcode if such fallback is allowed). App is only notified whether the authentication was successful or not, whole UI is managed b...

iOS • Keychain

Asynchronous Promises Chaining

If you have multiple asynchronous tasks that needs to occur one after the other, you will need to chain together their promise objects. Here is a simple example: function First() { console.log("Calling Function First"); return $.get("/ajax/GetFunction/First"); } fu...

jQuery • jQuery Deferred objects and Promises

Chaining messages with andThen

The andThen function allows update call composition. Can be used with the pipeline operator (|>) to chain updates. Example: You are making a document editor, and you want that each modification message you send to your document, you also save it: import Update.Extra exposing (andThen) import U...

Elm Language • Making complex update functions with ccapndave/elm-update-extra