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.

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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:

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Interduction

How to do

First way

First step

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[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:

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What's difference between braces and do..end

Actually, there're no so big difference. But the priority is difference. We can check an example out as below then we can understand.

my_array = [1, 2, 3, 4, 5]

# <1>
p my_array.map { |item|

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[TOC]

Introduction

How to do

Using if statment

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Introcution

Sometimes we want to use chain method and Ruby also provides it.

It seems wonderful, BUT (Always BUT appears when everything is good 😭) the some chain methods only can run under some conditions. But we cannot do as like

obj.new
  .add(xxx) if xxx.present?  # Here will happen an error.

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Zip

def zip_files(src_path, dst_path_with_filename='zipfile.zip'):
    """
    :param src_path: a list of the files you want to zip.
    :param dst_path_with_filename: the destination path with file name of the zip file.
    :return: None
    """

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Introduction

Always I confuse &&= and ||=, what's difference between them?

Magic

operation &&=

a &&= b

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// A class
fun caller() {
    // here we will set callback function.
    callbackProcessor.subscriby {
        // Here I can get `5566`, and do somthing.
    }
}

// B class
fun callee() {