本週學習心得分享Vic Chih2015-11-27

本週主題• 上週作業 -override & new• LINQ

– 作業四– 作業五– Select & SelectMany

• Javascript – function– Self invoking anonymous function– Closures

上週作業 -Override and new

•

　 {A} nemo = new {B};{A} {B} move moveby

override

Animal Animal move by： run runFish Fish move by：

swim swim

Animal Fish move by：swim swim

Fish Animal Error

newAnimal Animal move by： run run

Fish Fish move by： run swimAnimal Fish move by： run run

Fish Animal Error

當方法重複時 C#會先使用父類別的方法

LINQ 作業四

• Union、 Concat• OrderBy、 OrderByDescending• where

LINQ 作業五

Select、 SelectMany• Select and SelectMany are projection operators. Select

operator is used to select value from a collection and SelectMany operator is used to select values from a collection of collection i.e. nested collection.

Javascript• First-class function

– The language supports passing functions as arguments to other functions, returning them as the values from other functions, and assigning them to variables or storing them in data structures.

• Prototype-based programming– Prototype-based programming is an OOP model that doesn't

use classes, but rather it first accomplishes the behavior of any class and then reuses it (equivalent to inheritance in class-based languages) by decorating (or expanding upon) existing prototype objects. (Also called classless, prototype-oriented, or instance-based programming.)

Javascript-function• 直接宣告：

– function declaration

• 匿名宣告：– function expression

Javascript-Self invoking anonymous function

• Self invoking anonymous function• 常用於一次性的呼叫• Function內的變數或 function都是區域性的無法在外使用

Javascript - Closures

• A closure is a special kind of object that combines two things: a function, and the environment in which that function was created. The environment consists of any local variables that were in-scope at the time that the closure was created.

• Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure 'remembers' the environment in which it was created.

Javascript - Closures

•

Reference• http://www.dotnet-tricks.com/Tutorial/linq/N74N160714-Difference-between-Select-

and-SelectMany-in-LINQ.html

• https://en.wikipedia.org/wiki/Prototype-based_programming

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures

Thank you for your listening