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@Singleton
@Component(modules = arrayOf(AppModule::class,
    RepositoryModule::class,
    BindingActivityModule::class,
    AndroidSupportInjectionModule::class))
interface AppComponent : AndroidInjector<App> {
    /** [AndroidInjector] Builder for using on this whole app. */
    @Component.Builder
    abstract class Builder : AndroidInjector.Builder<App>()

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override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
    // Measure all of children's width & height.
    this.measureChildren(widthMeasureSpec, heightMeasureSpec)
    // Measure width & height of this view_group's layout(layout_width or layout_height will be `match_parent`
    // no matter what we set `wrap_content` or `match_patent` when we're using getDefaultSize).
    // We'll reset this method by another way for achieving `wrap_content`.
    val mini = minOf(getDefaultSize(suggestedMinimumWidth, widthMeasureSpec), getDefaultSize(suggestedMinimumHeight, heightMeasureSpec))
    this.setMeasuredDimension(mini, mini)
}

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// There is a class with generic parameter.
abstract class A<T> {
    // This is KClass version.
    val t: T by lazy {
        (this@A::class
            .supertypes.first()  // KType of A class
            .arguments.first()  // Data type of the generic T
            .type!!.classifier as KClass<*>)  // The class of the generic T 
            .primaryConstructor!!.call() as T  // An object from the generic T
    }

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[TOC]

Introduction

Ruby and Kotlin have the same magic candy function!

What's kind of magic candy function?

Kotlin

• apply (also)

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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() {

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Introduction

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

Magic

operation &&=

a &&= b

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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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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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[TOC]

Introduction

How to do

Using if statment

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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|