Tutorial by Examples: i

Shortest match: $ a='I am a string' $ echo "${a%a*}" I am Longest match: $ echo "${a%%a*}" I

First match: $ a='I am a string' $ echo "${a/a/A}" I Am a string All matches: $ echo "${a//a/A}" I Am A string Match at the beginning: $ echo "${a/#I/y}" y am a string Match at the end: $ echo "${a/%g/N}" I am a strinN Replace a pattern wi...

Inheritance is the biggest asset of the POM, where the following can be managed from super POM to child POM. dependencies developers and contributors plugin lists (including reports) plugin executions with matching ids plugin configuration The following enables the inheritance <paren...

The modules of a multi-module project are aggregated from a hierarchical structure. The root pom packing should look like: <packaging>pom</packaging> The following will be the directory structure of the project: |-- sample-app \ `-- pom.xml |-- sample-module-1 | `--...

In [15]: df = pd.DataFrame({"A":[1,1,2,3,1,1],"B":[5,4,3,4,6,7]}) In [21]: df Out[21]: A B 0 1 5 1 1 4 2 2 3 3 3 4 4 1 6 5 1 7 To get unique values in column A and B. In [22]: df["A"].unique() Out[22]: array([1, 2, 3]) In [23]: df[&qu...

Creates a image representing a linear gradient of colors. linear-gradient( 0deg, red, yellow 50%, blue); This creates a gradient going from bottom to top, with colors starting at red, then yellow at 50%, and finishing in blue.

You can take advantage of Apache Maven's powerful features in Eclipse by installing the M2Eclipse feature. Follow these steps to install Maven in Eclipse: Open Eclipse and select Help → Install New Software… In the opened dialog, select the Add... button to add a new repository. Fill ...

For checking whether some object is of a certain class, the (binary) instanceof operator can be used since PHP version 5. The first (left) parameter is the object to test. If this variable is not an object, instanceof always returns false. If a constant expression is used, an error is thrown. The ...

An operator can be used to manipulate the flow of objects from Observable to Subscriber. Observable<Integer> integerObservable = Observable.just(1, 2, 3); // creating a simple Integer observable Subscriber<String> mSubscriber = new Subscriber<String>() { @Override publi...

Following example illustrate the simplest Hello World in groovy using script, place the following code snippet in a file, say helloWorld.groovy println 'Hello World!' How to execute: In the command line, groovy helloWorld.groovy Output: Hello World!

You can use buffers to work with multiple files. When you open a file using :e path/to/file it opens in a new buffer (the command means edit the file). New buffer that holds a temporary copy of the file. You can go to previous buffer with :bp[rev] and next buffer with :bn[ext]. You can go to a...

Commands have one input (STDIN) and two kinds of outputs, standard output (STDOUT) and standard error (STDERR). For example: STDIN root@server~# read Type some text here Standard input is used to provide input to a program. (Here we're using the read builtin to read a line from STDIN.) STDO...

If you want to see the generated bytecode for a Java program, you can use the provided javap command to view it. Assuming that we have the following Java source file: package com.stackoverflow.documentation; import org.springframework.stereotype.Service; import java.io.IOException; import j...

You can use the .Net Math class to do calculations ([System.Math]) If you want to know which methods are available you can use: [System.Math] | Get-Member -Static -MemberType Methods Here are some examples how to use the Math class: PS C:\> [System.Math]::Floor(9.42) 9 PS C:\> [System....

{ echo "contents of home directory" ls ~ } > output.txt

It is possible to effectively apply a function (cb) which returns a promise to each element of an array, with each element waiting to be processed until the previous element is processed. function promiseForEach(arr, cb) { var i = 0; var nextPromise = function () { if (i >= arr.leng...

The ember data models have a toJSON method that extracts the relevant data: console.log(model.toJSON()); This method uses the JSONSerializer to create the JSON representation. If you want to log the data in a more app-specific way, you can use serialize: model.serialize(); which uses the se...

Ember has a static global method called runInDebug which can run a function meant for debugging. Ember.runInDebug(() => { // this code only runs in dev mode }); In a production build, this method is defined as an empty function (NOP). Uses of this method in Ember itself are stripped from ...

Schedulers are an RxJava abstraction about processing unit. A scheduler can be backed by a Executor service, but you can implement your own scheduler implementation. A Scheduler should meet this requirement : Should process undelayed task sequencially (FIFO order) Task can be delayed A Sched...

import pandas as pd df = pd.DataFrame({'gender': ["male", "female","female"], 'id': [1, 2, 3] }) >>> df gender id 0 male 1 1 female 2 2 female 3 To encode the male to 0 and female to 1: df.loc[df["gender&quot...