Tutorial by Examples: u

Go to the repository you want to clone (something like: https://bitbucket.org/username/repo) On the top menu, choose Repository -> Import repository In the Old repository section, enter the source (CodePlex, Git, Google Code, Mercurial, Source Code, Subversion) and the URL In the New reposi...

Swift does not support multiple inheritance. That is, you cannot inherit from more than one class. class Animal { ... } class Pet { ... } class Dog: Animal, Pet { ... } // This will result in a compiler error. Instead you are encouraged to use composition when creating your types. This can b...

import org.apache.spark.sql.functions._ // Create a function that uses the content of the column inside the dataframe val code = (param: String) => if (param == "myCode") 1 else 0 // With that function, create the udf function val myUDF = udf(code) // Apply the udf to a column in...

You can test sending messages using the FCM REST API by sending a request through cURL. curl --header "Authorization: key=<API_KEY>" \ --header Content-Type:"application/json" \ https://fcm.googleapis.com/fcm/send \ -d "{\"registration_ids...

Higher-order functions take other functions as arguments and/or return them as results. They form the building blocks of functional programming. Most functional languages have some form of filter function, for example. This is a higher-order function, taking a list and a predicate (function that ret...

iOS 10 Now Requires User Permission to Access Media Library, Photos, Camera and other Hardware like these. The solution for this is to add their keys into info.plist with description for user that how we are using their data , iOS already required permissions to access microphone, camera, and m...

From Xcode menu open: Product > Scheme > Edit Scheme. On your Environment Variables set OS_ACTIVITY_MODE = disable

SELECT item.item_id, item.name, /* not SQL-92 */ COUNT(*) number_of_uses FROM item JOIN uses ON item.item_id, uses.item_id GROUP BY item.item_id will show the rows in a table called item, and show the count of related rows in a table called uses. This works well, but unfo...

SELECT item.item_id, uses.category, /* nonstandard */ COUNT(*) number_of_uses FROM item JOIN uses ON item.item_id, uses.item_id GROUP BY item.item_id will show the rows in a table called item, and show the count of related rows in a table called uses. It will also show the va...

Sometimes a query looks like this, with a * in the SELECT clause. SELECT item.*, /* nonstandard */ COUNT(*) number_of_uses FROM item JOIN uses ON item.item_id, uses.item_id GROUP BY item.item_id Such a query needs to be refactored to comply with the ONLY_FULL_GROUP_BY sta...

Use may now use the connExecute-Function for executing a query. You have the option to get the query result as an object or array. The result ist printed to console.log. function connExecute(err, connection) { if (err) { console.error(err.message); return; } sql = ...

To simplify your querying from ORACLE-DB, you may want to call your query like this: const oracle = require('./oracle.js'); const sql = "select 'test' as c1, 'oracle' as c2 from dual"; oracle.queryObject(sql, {}, {}) .then(function(result) { console.log(result.rows[0]['C...

For more complicated projects, or in cases where you intend to gradually type a dependency, it may be cleaner to create a module. Using JQuery (although it does have typings available) as an example: // place in jquery.d.ts declare let $: any; export default $; And then in any file in your pr...

If you just want to indicate the intent of an import (so you don't want to declare a global) but don't wish to bother with any explicit definitions, you can import an ambient module. // in a declarations file (like declarations.d.ts) declare module "jquery"; // note that there are no ...

trash is a minimalistic vendoring tool that you configure with vendor.conf file. This example is for trash itself: # package github.com/rancher/trash github.com/Sirupsen/logrus v0.10.0 github.com/urfave/cli v1.18.0 github.com/cloudfoundry-incubat...

Create a new HTML tag named <hello-world> that will display "Hello, World!": <script> //define a class extending HTMLElement class HelloWorld extends HTMLElement { connectedCallback () { this.innerHTML = 'Hello, World!' } } //register the new custom elem...

In lua, the logical operators and and or returns one of the operands as the result instead of a boolean result. As a consequence, this mechanism can be exploited to emulate the behavior of the ternary operator despite lua not having a 'real' ternary operator in the language. Syntax condition and...

NSMutableArray *array = [NSMutableArray arrayWithObjects:@"Ken", @"Tim", @"Chris", @"Steve",@"Charlie",@"Melissa", nil]; NSPredicate *bPredicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] 'c'"]; NSArray ...

String and character literals provide an escape mechanism that allows express character codes that would otherwise not be allowed in the literal. An escape sequence consists of a backslash character (\) followed by one ore more other characters. The same sequences are valid in both character an st...

Read the documentation in this order to easily learn postscript: Paul Bourke's excellent tutorial: http://paulbourke.net/dataformats/postscript/ Blue Book, first half, the original official tutorial: http://www-cdf.fnal.gov/offline/PostScript/BLUEBOOK.PDF Green Book, how to use posts...