pokk

[TOC]

Interduction

Using block, proc, lambda or shorthand for devleoping easily. We don't need to code so many words and coding style is elegant.

Map class shorthand

We're often using the simplest way to code a map lambda method. A well-known example:

pokk

Interduction

How to do

First way

First step

pokk

Introduction

If you can control your view size, for example as loading an imageview. You observe it then you can get the view size after the image is downloaded. You don't have to worry about when it is drawed and measured.

Example

OnCreate()

In Kotlin code:

pokk

Introduction

Script

We have this script for creating a ramdisk.

• $((5x100x2048x2x__4__)) = 4096MB

You can change the number with bold and itan. Basic is 1024 * N size.

pokk

Introduction

In Javascript to create an array of number from 0 to n-1, we can use spread operator. It is part of ECMAScript (version 6). Currently IE does not have good support for it. It can be used in node scripts safely though.

array of number from 0 to n-1

We can use array of empty values and keys function. Note that Array(10) generates array of empty values of size 10.

var arr = [...Array(10).keys()]

pokk

Introduction

Thread category in Android.

Java

• Thread
• Handler
• AsyncTask
• IntentService

pokk

[TOC]

Introduction

The app will show white screen or black screen each time when you cold start the app. For UX or UI, this is not good user experenice.

For that, we will fix knid of small problem with the splash view.

How to do

pokk

Introduction

Add the html loading ready in Javascript.

Javascript

There is a standards based replacement,DOMContentLoaded that is supported by over 98% of browsers, though not IE8.

pokk

Introduction

Show raw HTML data and ruby variable.

Front xxx.html.erb

Concat

concat this key word is the same as echo in PHP.

pokk

Introduction

Click a button and copy the assigned textarea or input's content to clipboard.

Html

<input type="text" id="copy_target" value="Text to Copy">
<button id="copy_button">Copy</button>