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crazylion lee

The guide to implementing 2D platformers | Higher-Order Fun - 0 views

higherorderfun.com/...to-implementing-2d-platformers

Gamedev 2D game programming

shared by crazylion lee on 03 Oct 15 - No Cached
  • Having previously been disappointed by the information available on the topic, this is my attempt at categorizing different ways to implement 2D platform games, list their strengths and weaknesses, and discuss some implementation details.
張 旭

The Difference Between Ruby Symbols and Strings - Robert Sosinski - 0 views

www.robertsosinski.com/...tween-ruby-symbols-and-strings

ruby rails symbol programming

shared by 張 旭 on 09 Jan 14 - No Cached
  • Symbols are immutable
  • immutable objects can only be overwritten
  • mutable Strings can have their share of issues in terms of creating unexpected results and reduced performance
張 旭

How to Use Docker on OS X: The Missing Guide | Viget - 0 views

viget.com/...cker-on-os-x-the-missing-guide

docker mac system deploy

shared by 張 旭 on 25 Oct 14 - No Cached
  • Docker is a client-server application.
  • The Docker server is a daemon that does all the heavy lifting: building and downloading images, starting and stopping containers, and the like. It exposes a REST API for remote management.
  • The Docker client is a command line program that communicates with the Docker server using the REST API.
  • ...9 more annotations...
  • interact with Docker by using the client to send commands to the server.
  • The machine running the Docker server is called the Docker host
  • Docker uses features only available to Linux, that machine must be running Linux (more specifically, the Linux kernel).
  • boot2docker is a “lightweight Linux distribution made specifically to run Docker containers.”
  • Docker server will run inside our boot2docker VM
  • boot2docker, not OS X, is the Docker host, not OS X.
  • Docker mounts volumes from the boot2docker VM, not from OS X
  • initialize boot2docker (we only have to do this once):
  • The Docker client assumes the Docker host is the current machine. We need to tell it to use our boot2docker VM by setting the DOCKER_HOST environment variable
張 旭

Code Review: 超越 "审、查、评" 的代码回顾 » 社區 » Coding Style - 0 views

www.codingstyle.cn/35

code programming team

shared by 張 旭 on 28 Dec 15 - No Cached
  • 在相互挑错的场合里，人的内心会本能地封闭起来，来抗拒那些针对自己的批评意见。相互挑错所造成的紧张气氛，会让程序员对Code Review望而却步，从而情绪低落，这会让Code Review的效果大打折扣。
  • 把Code Review称为“代码回顾”好一些。如果大家放弃“挑错”，来“共同学习”
  • 团队成员共同识别模式
  • ...10 more annotations...
  • 程序员编写代码的习惯
  • 几百行的一个类文件
  • 复杂的if-else嵌套
  • 代码回顾的过程中，完全可以不提谁是代码的作者，而只提“好模式”和“反模式”，这样能让作者放松心态
  • 好模式和反模式，其实就是编程的好习惯和坏习惯。代码回顾应该重在识别编程习惯，而不是找bug
  • 代码回顾也需要每次少量，每日持续
  • 将每日代码回顾的时间控制在半小时以内，细水长流，才能持续
  • 每日的代码回顾，仅需要在半小时内，大家一起看200～300行随机抽取的当天编写的代码就够了
  • 如果代码编写得好，那么不是作者的人就能在没有作者帮助的情况下读懂。我希望一位不是这段代码作者的志愿者，来为大家解释一下这段代码是做什么的。
  • 要尽量找那些被改正过来的曾经的反模式，比如“这段代码用到了方法提取，且命名富有表达力，改掉了昨天’长方法’的反模式”。只识别反模式，不识别好模式，会让代码回顾退化到令人生畏的代码审查，打掉大家长期坚持的积极性。
張 旭

Why we should stop using Grunt & Gulp - 0 views

blog.keithcirkel.co.uk/why-we-should-stop-using-grunt

grunt gulp javascript programming toolkit

shared by 張 旭 on 19 Jan 16 - No Cached
  • All of these task runners (or build systems if you want to call them that) try to abstract some kind of task paradigm away into their own siloed incantations.
  • Gulp isn't the only culprit either; Jake, Broccoli, Brunch and Mimosa all require plugins to install as well, which means when using any of these task runners, you're essentially just installing 1 more dependency (the task runner) than if you had no task runner, and just used each of the projects own binaries
張 旭

Active Record Basics - Ruby on Rails Guides - 0 views

guides.rubyonrails.org/active_record_basics.html

ruby rails programming development framework model database object

shared by 張 旭 on 22 Jan 14 - No Cached
  • the model - which is the layer of the system responsible for representing business data and logic.
  • Active Record facilitates the creation and use of business objects whose data requires persistent storage to a database
  • Rails will pluralize your class names to find the respective database table.
  • ...33 more annotations...
  • objects carry both persistent data and behavior which operates on that data
  • Object-Relational Mapping, commonly referred to as its abbreviation ORM, is a technique that connects the rich objects of an application to tables in a relational database management system
  • Represent associations between these models
  • Validate models before they get persisted to the database
  • The idea is that if you configure your applications in the very same way most of the times then this should be the default way.
  • Database Table - Plural with underscores separating words
  • use the ActiveRecord::Base.table_name= method to specify the table name
  • Model Class - Singular with the first letter of each word capitalized
  • Foreign keys - These fields should be named following the pattern singularized_table_name_id
  • Primary keys - By default, Active Record will use an integer column named id as the table's primary key
  • created_at
  • updated_at
  • (table_name)_count - Used to cache the number of belonging objects on associations.
  • Single Table Inheritance (STI)
  • Object Relational Mapping
  • class_name.yml
  • ActiveRecord::Base.primary_key=
  • CRUD is an acronym for the four verbs we use to operate on data: Create, Read, Update and Delete.
  • new method will return a new object
  • create will return the object and save it to the database.
  • Using the new method, an object can be instantiated without being saved
  • user.save will commit the record to the database
  • update_all class method
  • an Active Record object can be destroyed which removes it from the database
  • Validation is a very important issue to consider when persisting to database, so the methods create, save and update take it into account when running: they return false when validation fails and they didn't actually perform any operation on database.
  • a bang counterpart
  • Active Record callbacks allow you to attach code to certain events in the life-cycle of your models
  • Rails keeps track of which files have been committed to the database and provides rollback features
  • rake db:migrate
  • rake db:rollback
  • Convention over Configuration
    • 張 旭
      張 旭 on 12 Apr 16
       
      Model 是單數，Table 是複數。想象一下，處理 Object 的時候是逐一處理，但是存放的地方是放了一堆 Objects。
    • 張 旭
      張 旭 on 12 Apr 16
       
      外鍵是單數的形式，這也很好理解：因為關聯到的是一個外部的 Object
張 旭

Why it took a long time to build that tiny link preview on Wikipedia - Wikimedia Blog - 0 views

blog.wikimedia.org/...tiny-link-preview-on-wikipedia

programming performance website image

shared by 張 旭 on 16 Oct 18 - No Cached
  • taken a few years for us to get this out to everyone
  • 張 旭 on 16 Oct 18
     
    "taken a few years for us to get this out to everyone"
張 旭

Bash Reference Manual: Shell Parameter Expansion - 1 views

www.gnu.org/...Shell-Parameter-Expansion.html

shell script programming

shared by 張 旭 on 30 Nov 18 - No Cached
  • parameter expansion
  • command substitution
  • arithmetic expansion
  • ...16 more annotations...
  • The parameter name or symbol to be expanded may be enclosed in braces, which are optional but serve to protect the variable to be expanded from characters immediately following it which could be interpreted as part of the name.
  • When braces are used, the matching ending brace is the first ‘}’ not escaped by a backslash or within a quoted string, and not within an embedded arithmetic expansion, command substitution, or parameter expansion.
  • ${parameter}
  • braces are required
  • If the first character of parameter is an exclamation point (!), and parameter is not a nameref, it introduces a level of variable indirection.
  • ${parameter:-word} If parameter is unset or null, the expansion of word is substituted. Otherwise, the value of parameter is substituted.
  • ${parameter:=word} If parameter is unset or null, the expansion of word is assigned to parameter.
  • ${parameter:?word} If parameter is null or unset, the expansion of word (or a message to that effect if word is not present) is written to the standard error and the shell, if it is not interactive, exits.
  • ${parameter:+word} If parameter is null or unset, nothing is substituted, otherwise the expansion of word is substituted.
  • ${parameter:offset} ${parameter:offset:length}
  • Substring expansion applied to an associative array produces undefined results.
  • ${parameter/pattern/string} The pattern is expanded to produce a pattern just as in filename expansion.
  • If pattern begins with ‘/’, all matches of pattern are replaced with string.
  • Normally only the first match is replaced
  • The ‘^’ operator converts lowercase letters matching pattern to uppercase
  • the ‘,’ operator converts matching uppercase letters to lowercase.
張 旭

迷途工程師: Makefile的賦值運算符(=, :=, +=, ?=) - 0 views

dannysun-unknown.blogspot.com/...makefile.html

linux makefile programming

shared by 張 旭 on 20 Dec 18 - No Cached
  • = 是最基本的賦值 := 會覆蓋變數之前的值 ?= 變數為空時才給值，不然則維持之前的值 += 將值附加到變數的後面
  • = 在執行時擴展(values within it are recursively expanded when the variable is used, not when it's declared) := 在定義時擴展(values within it are expanded at declaration time)
  • 張 旭 on 20 Dec 18
     
    "= 是最基本的賦值 := 會覆蓋變數之前的值 ?= 變數為空時才給值，不然則維持之前的值 += 將值附加到變數的後面 "
張 旭

GNU make: Special Variables - 0 views

www.gnu.org/...Special-Variables.html

linux makefile programming

shared by 張 旭 on 20 Dec 18 - No Cached
  • include inc.mk
  • .DEFAULT_GOAL
  • assigning more than one target name to .DEFAULT_GOAL is invalid and will result in an error.
  • ...6 more annotations...
  • If the variable is empty (as it is by default) that character is the standard tab character.
  • “else if” non-nested conditionals
  • .ONESHELL special target
  • target-specific and pattern-specific
  • “shortest stem” method of choosing which pattern
  • make searches for included makefiles (see Including Other Makefiles)
張 旭

pre-commit - 0 views

pre-commit.com

programming code development

shared by 張 旭 on 21 Dec 18 - No Cached
  • a multi-language package manager for pre-commit hooks
  • pre-commit is specifically designed to not require root access
  • We copied and pasted unwieldy bash scripts from project to project and had to manually change the hooks to work for different project structures.
  • ...3 more annotations...
  • adding pre-commit plugins to your project is done with the .pre-commit-config.yaml configuration file.
  • The pre-commit config file describes what repositories and hooks are installed.
  • This configuration says to download the pre-commit-hooks project and run its trailing-whitespace hook
  • 張 旭 on 21 Dec 18
     
    "a multi-language package manager for pre-commit hooks"
張 旭

Makefiles - Best practices and suggestions | MDN - 0 views

developer.mozilla.org/...Best_practices_and_suggestions

linux makefile programming development

shared by 張 旭 on 24 Dec 18 - No Cached
  • hardcoded values - avoid them like the plague
  • For classes of hardware (unix/windows) place your makefile in a subdirectory, unix/Makefile.in
  • Initial make call should always be the workhorse: build, generate, deploy, install, etc.
  • ...6 more annotations...
  • All subsequent make calls must become a NOP unless sources or dependencies change or have been removed.
    • 張 旭
      張 旭 on 24 Dec 18
       
      No Operation 或 No Operation Performed 的縮寫，意為無操作
    • 張 旭
      張 旭 on 24 Dec 18
  • Do not use directories as a dependency for generated targets, ever.
  • Parallel make: add an explicit timestamp dependency (.done) that make can synchronize threaded calls on to avoid a race condition.
  • Maintain clean targets - makefiles should be able to remove all content that is generated so "make clean" will return the sandbox/directory back to a clean state.
  • Wrapper check/unit tests with a ENABLE_TESTS conditional
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