Adan  Auer

Adan Auer

1596041040

Cleaning Code, Refactoring in SwiftUI

The Brief

I’m going to make this straightforward because it’s a tutorial. The brief calls for five boxes — a large one in the center and four smaller ones around the edges. All five boxes should move in the direction of one of the smaller boxes when tapped, like this:

Image for post

The client’s brief


The Solution

It looks easy enough. Here’s our first draft of the code to do the job. A quick and simple implementation to get something down. Note that the body of the main loop is some 45 lines. This is what we need to fix when we refactor this:

import SwiftUI

	struct SwiftUIViewG1: View {
	    @State var offSetX: CGFloat = 0
	    @State var offsetY: CGFloat = 0
	    var body: some View {
	      ZStack {
	        ZStack {
	          Rectangle()
	            .stroke(Color.black, lineWidth: 2)
	            .frame(width: 128, height: 128)
	        }
	        ZStack {
	          Rectangle()
	            .stroke(Color.red, lineWidth: 2)
	            .frame(width: 32, height: 32)
	            .onTapGesture {
	              offSetX -= 10; offsetY -= 10
	            }
	        }.frame(width: 256, height: 256, alignment: .topLeading)
	        ZStack {
	          Rectangle()
	            .stroke(Color.blue, lineWidth: 2)
	            .frame(width: 32, height: 32)
	            .onTapGesture {
	              offSetX += 10; offsetY -= 10
	            }
	        }.frame(width: 256, height: 256, alignment: .topTrailing)
	        ZStack {
	          Rectangle()
	            .stroke(Color.green, lineWidth: 2)
	            .frame(width: 32, height: 32)
	            .onTapGesture {
	              offSetX -= 10; offsetY += 10

	            }
	        }.frame(width: 256, height: 256, alignment: .bottomLeading)
	        ZStack {
	          Rectangle()
	            .stroke(Color.yellow, lineWidth: 2)
	            .frame(width: 32, height: 32)
	            .onTapGesture {
	              offSetX += 10; offsetY += 10

	            }
	        }.frame(width: 256, height: 256, alignment: .bottomTrailing)
	      }.offset(x:offSetX, y:offsetY)
	    }
	}

	struct SwiftUIViewG1_Previews: PreviewProvider {
	    static var previews: some View {
	        SwiftUIViewG1()
	    }
	}

Right, so how did we do it? Well, we simply created five rectangles within some ZStacks and added some onTapGestures to move the boxes around when they were tapped. Now let’s try to make this a better piece of code.

#swiftui #ios #swift

What is GEEK

Buddha Community

Cleaning Code, Refactoring in SwiftUI
Houston  Sipes

Houston Sipes

1604088000

How to Find the Stinky Parts of Your Code (Part II)

There are more code smells. Let’s keep changing the aromas. We see several symptoms and situations that make us doubt the quality of our development. Let’s look at some possible solutions.

Most of these smells are just hints of something that might be wrong. They are not rigid rules.

This is part II. Part I can be found here.

Code Smell 06 - Too Clever Programmer

The code is difficult to read, there are tricky with names without semantics. Sometimes using language’s accidental complexity.

_Image Source: NeONBRAND on _Unsplash

Problems

  • Readability
  • Maintainability
  • Code Quality
  • Premature Optimization

Solutions

  1. Refactor the code
  2. Use better names

Examples

  • Optimized loops

Exceptions

  • Optimized code for low-level operations.

Sample Code

Wrong

function primeFactors(n){
	  var f = [],  i = 0, d = 2;  

	  for (i = 0; n >= 2; ) {
	     if(n % d == 0){
	       f[i++]=(d); 
	       n /= d;
	    }
	    else{
	      d++;
	    }     
	  }
	  return f;
	}

Right

function primeFactors(numberToFactor){
	  var factors = [], 
	      divisor = 2,
	      remainder = numberToFactor;

	  while(remainder>=2){
	    if(remainder % divisor === 0){
	       factors.push(divisor); 
	       remainder = remainder/ divisor;
	    }
	    else{
	      divisor++;
	    }     
	  }
	  return factors;
	}

Detection

Automatic detection is possible in some languages. Watch some warnings related to complexity, bad names, post increment variables, etc.

#pixel-face #code-smells #clean-code #stinky-code-parts #refactor-legacy-code #refactoring #stinky-code #common-code-smells

Wiley  Mayer

Wiley Mayer

1603890000

How to Find the Stinky Parts of Your Code (Part I)

of something that might be wrong. They are not rigid rules.

Code Smell 01 — Anemic Models

Your objects are a bunch of public attributes without behavior.

Photo by Stacey Vandergriff on Unsplash

Protocol is empty (with setters/getters).

If we ask a domain expert to describe an entity he/she would hardly tell it is ‘a bunch of attributes’.

Problems

  • No Encapsulation.
  • No mapping to real world entities.
  • Duplicate Code
  • Coupling

Solutions

    1. Find Responsibilities.
    1. Protect your attributes.
    1. Hide implementations.
    1. Delegate

Examples

  • DTOs

Sample Code

	<?

	Class Window{
	  public height;
	  public width;

	  function getHeight(){
	    return $this->height;
	  }

	  function setHeight($height){
	    $this->height = $height;
	  }

	  function getWidth(){
	    return $this->width;
	  }

	  function setWidth($width){
	    $this->width = $width;
	  }

	}

Wrong

<?

	final Class Window{ 

	  function area(){
	    //...
	  }

	  function open(){
	    //..
	  }

	  function isOpen(){
	    //..
	  }

	}

Right

#code-smells #clean-code #refactoring #refactor-legacy-code #stinky-code #stinky-code-parts #pixel-face #hackernoon-top-story

Code Trashing Symptom

There are a set of skills and qualities which make the ideal software

developer we are all searching to be or searching for to employ. However, right now I am going to emphasize the importance of a quality that is mostly found in senior developers.

As a beginner, I remember the enthusiasm when I implemented my first app. It was in VisualBasic v6.0 with very basic UI and logic. From there on,

it was very hard to leave the keyboard without writing code daily. At

first, it was VB, then some HTML, JavaScript (when it was very buggy),

Java, and sometime later I became a true working developer/team-leader

for many years.

Reliving those days when I was an enthusiast developer, I remember the powerful feeling that kept me on my path. I was (and still) addicted to code. But it is not code I was after. It is the vast feeling of creating something your own. Creating something from within. This strong feeling of a new creation is addictive.

The problem with addiction is that you don’t recognize the limits of

yourself and your creations. Consequently, you are not guided by your

consciousness.

As a leader of development teams in different projects, I came across a

variety of situations with different developers. But this same question I kept hearing from time to time, “This is a great piece of code, do you really want me to remove it?”, and it is really a great piece of code with the ultimate design.

But what you shouldn’t forget that you and your team are here to accomplish something meaningful for your clients and users! Thus writing a greatly designed code with low correlation to requirements isn’t going to change anything.

When I moved to my current team and project, I found out that the project’s code was written beautifully and well designed. But it was insignificant to our client’s future requirements.

One of the best decisions I made was to gradually re-implement (remove old code and write a new one without reference nor copy-pasting any parts). The reason being the already written code was a big hurdle to bend to any new requirements we received

Sometimes it’ll be hard to ask for, especially when you’re asking the original author of the code. But always remind him of these facts: your main focus is your clients; if you miss your code, Github will always remember it for you.

Acknowledging your addiction to code is your first step to overcoming your unconscious desire to create worthless stuff that no one will use (and believe me, it hurts more to find out that your code is useless than

removing a code you’ve written).

Final Thoughts

From my personal experience, when you implement something hard to solve the first time, most of your energy and thoughts are invested in solving the problem and not in the most relevant design for the given requirements.

Rewriting the same code a second time gives you a second chance to spend your time (almost solely) in design (since the problem is already

solved).

The best design is a design made for the current (known) requirements and not future mystic stuff that we just came up with.

**Remember: **Refactor! Don’t predict!

#clean-code #best-practices #programming #development #refactoring #coding #coding-skills #coding-life

Tyrique  Littel

Tyrique Littel

1604008800

Static Code Analysis: What It Is? How to Use It?

Static code analysis refers to the technique of approximating the runtime behavior of a program. In other words, it is the process of predicting the output of a program without actually executing it.

Lately, however, the term “Static Code Analysis” is more commonly used to refer to one of the applications of this technique rather than the technique itself — program comprehension — understanding the program and detecting issues in it (anything from syntax errors to type mismatches, performance hogs likely bugs, security loopholes, etc.). This is the usage we’d be referring to throughout this post.

“The refinement of techniques for the prompt discovery of error serves as well as any other as a hallmark of what we mean by science.”

  • J. Robert Oppenheimer

Outline

We cover a lot of ground in this post. The aim is to build an understanding of static code analysis and to equip you with the basic theory, and the right tools so that you can write analyzers on your own.

We start our journey with laying down the essential parts of the pipeline which a compiler follows to understand what a piece of code does. We learn where to tap points in this pipeline to plug in our analyzers and extract meaningful information. In the latter half, we get our feet wet, and write four such static analyzers, completely from scratch, in Python.

Note that although the ideas here are discussed in light of Python, static code analyzers across all programming languages are carved out along similar lines. We chose Python because of the availability of an easy to use ast module, and wide adoption of the language itself.

How does it all work?

Before a computer can finally “understand” and execute a piece of code, it goes through a series of complicated transformations:

static analysis workflow

As you can see in the diagram (go ahead, zoom it!), the static analyzers feed on the output of these stages. To be able to better understand the static analysis techniques, let’s look at each of these steps in some more detail:

Scanning

The first thing that a compiler does when trying to understand a piece of code is to break it down into smaller chunks, also known as tokens. Tokens are akin to what words are in a language.

A token might consist of either a single character, like (, or literals (like integers, strings, e.g., 7Bob, etc.), or reserved keywords of that language (e.g, def in Python). Characters which do not contribute towards the semantics of a program, like trailing whitespace, comments, etc. are often discarded by the scanner.

Python provides the tokenize module in its standard library to let you play around with tokens:

Python

1

import io

2

import tokenize

3

4

code = b"color = input('Enter your favourite color: ')"

5

6

for token in tokenize.tokenize(io.BytesIO(code).readline):

7

    print(token)

Python

1

TokenInfo(type=62 (ENCODING),  string='utf-8')

2

TokenInfo(type=1  (NAME),      string='color')

3

TokenInfo(type=54 (OP),        string='=')

4

TokenInfo(type=1  (NAME),      string='input')

5

TokenInfo(type=54 (OP),        string='(')

6

TokenInfo(type=3  (STRING),    string="'Enter your favourite color: '")

7

TokenInfo(type=54 (OP),        string=')')

8

TokenInfo(type=4  (NEWLINE),   string='')

9

TokenInfo(type=0  (ENDMARKER), string='')

(Note that for the sake of readability, I’ve omitted a few columns from the result above — metadata like starting index, ending index, a copy of the line on which a token occurs, etc.)

#code quality #code review #static analysis #static code analysis #code analysis #static analysis tools #code review tips #static code analyzer #static code analysis tool #static analyzer

Jackson George

1604649613

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