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/*
 *
 * Given a string S, return the “reversed” string where all characters that are not a letter stay in the same place,
 * and all letters reverse their positions.
 *
 * Example 1:
 *   Input: “ab-cd”
 *   Output: “dc-ba”
 *
 * Example 2:

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import android.content.Context
import android.util.AttributeSet
import android.view.View
import android.graphics.*
import android.graphics.PorterDuff
import android.graphics.PorterDuffXfermode


class BarcodeView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0

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How to build GStreamer cerbero for Android

###Clone and build cerbero

clone cerbero from gstreamer, not sdk/gstreamer

git clone git://anongit.freedesktop.org/gstreamer/cerbero

build cerbero for getting gstreamer-1.0-android-armv7-<version>.zip

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Installing Node.js on Amazon Linux AMI

The following will guide you through the process of installing Node.js on an AWS EC2 instance running Amazon Linux AMI 2016.09 - Release Notes

For this process I'll be using a t2.micro EC2 instance running Amazon Linux AMI (ami-d41d58a7). Once the EC2 instance is up-and-running, connect to your server via ssh

• Make sure our server has the latest packages : sudo yum update -y

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<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.view.ViewPager
    android:id="@+id/viewpager"
    android:layout_width="match_parent"

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#RxJS 5 Operators By Example

UPDATE: I have moved the contents of this gist plus more to https://github.com/btroncone/learn-rxjs and http://www.learnrxjs.io. For expanded examples, explanations, and resources, please check out this new location!

A complete list of RxJS 5 operators with easy to understand explanations and runnable examples.

Chinese Version by: @DrakeLeung

Table of Contents

• buffer

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# SYNTAX:

var pattern = new RegExp(pattern, attributes);  # attributes: g (global); i (case-sensitive); m (multiline matches)
var pattern = /pattern/attributes;  # same as above


# BRACKETS:

[...]: Any one character between the brackets.
[^...]: Any one character not between the brackets.

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// Node.js CheatSheet.
// Download the Node.js source code or a pre-built installer for your platform, and start developing today.
// Download: http://nodejs.org/download/
// More: http://nodejs.org/api/all.html


// 0. Synopsis.
// http://nodejs.org/api/synopsis.html

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/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

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/**
 * Check if the application is in the foreground or background.
 * *
 * Register this callbacks for an application
 * Application application = (Application) context.getApplicationContext();
 * application.registerActivityLifecycleCallbacks(new BaseLifeCycleCallbacks());
 * *
 * Note: These callbacks can be registered at any level of the application lifecycle.
 * Previous methods to get the application lifecycle forced the lifecycle callbacks to be registered