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Archive for August 18th, 2020

Nick Hodges on SOLID in TypeScript using Angular

Posted by jpluimers on 2020/08/18

For my link archive: after a long history of Delphi programming, Nick Hodges did a

SOLID series with TypeScript using Angular

[WayBack] Writing SOLID Code: SRP – Angles and Types on the Single Responsibility Principle
- via [WayBack] Single Responsibility Principle The Single Responsibility Principle states that a class should do one and only one thing. Uncle Bob says that it means “… – Nick Hodges – Google+
[WayBack] Writing SOLID Code: OCP – Angles and Types on the Open/Closed Principle
- via [WayBack] Open/Closed Principle The Open/Closed Principle states that a class should be open for extension but closed to change…. – Nick Hodges – Google+
[WayBack] Writing SOLID Code: LSP – Angles and Types on the Liskov Substitution Principle – Wikipedia
- via [WayBack] Liskov’s Substitution Principle is named after Barbara Liskov, the person who identified it…. – Nick Hodges – Google+
[WayBack] Writing SOLID Code: ISP – Angles and Types on the Interface Segregation Principle
- via [WayBack] The Interface Segregation Principle states that “Clients should not be forced to depend on methods that they do not use.”… – Nick Hodges – Google+
[WayBack] Writing SOLID Code: DIP – Angles and Types on the Dependency Inversion Principle
- via [WayBack] We’ve already seen the Dependency Inversion Principle in action when we looked at the SRP…. – Nick Hodges – Google+

They explain these SOLID – Wikipedia concepts:

After that, he did a series on:

[WayBack] Angular 101 – Angles and Types

[WayBack] Angular 101: Step 4 – The Main Pages – Angles and Types

More Angular and TypeScript

Since Nick likes that combination so much:

and his TypeScript series start:

and what started as a trilogy in 5 parts of his [WayBack] Angular 101 – Angles and Types became much longer:

DIID update

Nick also updated the public repository with the changes that did make it in his Dependency injection in Delphi book earlier:

[WayBack] Code for DIID Updated – Delphi-losophy
- via [WayBack] Thanks to the comment of a generous reader — whom I am ashamed to say I can’t remember — I have updated the code for Dependency Injection in Delphi to r… – Nick Hodges – Google+
[WayBack] NickHodges / nickdemocode / diid — Bitbucket
[WayBack] NickHodges / NickDemoCode / Commits — Bitbucket
- [WayBack] NickHodges / NickDemoCode / commit / c6c5763aa7e9 — Bitbucket: Removing use of the Global Container
- [WayBack] NickHodges / NickDemoCode / commit / e0e207911ca9 — Bitbucket: 000000: Changes to demo code

–jeroen

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Posted in Design Patterns, Development, Scripting, Software Development, TypeScript | Leave a Comment »

In the series “avoid Variants when coding in Delphi”: the comparison operator

Posted by jpluimers on 2020/08/18

For Variant types, the = comparison operator in Delphi maps to the VarCompareValue in the Variants unit.

That function fails to handle various comparisons and for some it knows it can handle raises a VarInvalidOp through various code paths (like CheckType) to VarInvalidOp because the implementation limits itself to varEmpty..varUInt64, which I think means that these are unsupported:

varRecord
varStrArg
varObject
varUStrArg
varString
varAny
varUString
varArray
varByRef

This fails when using the = operator:

What is this code supposed to do, if v1 and v2 are variant arrays with the same content?
if v1 = v2 then
  WriteLn('equal')
else
  WriteLn('not equal');

Spring4d has a function SameValue in the Spring.pas unit which handles more cases, at least the case when both operands are arrays having the same content.

Source: [WayBack] I think I may have mentioned that I hate Variants: What is this code supposed to do, if v1 and v2 are variant arrays with the same content? if v1 = v2… – Thomas Mueller (dummzeuch) – Google+

Thanks to Thomas Mueller and Stefan Glienke for this.

–jeroen

Posted in Delphi, Development, Software Development | Leave a Comment »

Some PlantUML links I needed for complex component diagram editing

Posted by jpluimers on 2020/08/18

A while ago, I had to create a bit more complex component diagrams than the simple ones I used to create in PlantUML.

Some links that helped me:

Linking between packages:
- a
  - Note I still do not understand why I cannot name a package like cloud [Back Office] as BO { .... }
Class diagrams have [WayBack] package styles (Node, Rectangle, Folder, Frame, Cloud, Database); component diagrams have various grouping keywords (package, node, folder, frame, cloud, database) which you can nest.
- Note you can perform [Component Description] as ComponentName, but not database [Database Description] as DatabaseName.
For a tool that does automatic lay-out, influencing the lay-out is always a bit of pain, see for instance:
- [WayBack] Better control of the layout of class diagrams – PlantUML Q&A
[WayBack] General and common command to handle graphic layout in diagrams.
- Comments ('), header/footer, scale (for zooming), title, caption, legend
- via [WayBack] Restricting the width of diagrams – PlantUML Q&A
[WayBack] PlantUml define relative position of components – Stack Overflow
- [WayBack] class diagram layout together and hidden (only for left to right and top to bottom relations)
[WayBack] PlantUML Pleasantness: Layout Elements With Hidden Lines – Messages from mrhaki:
- ' Layout Logging under BackendClient BackendClient -[hidden]- Logging
You can even hide components: [WayBack] Hide function in components diagrams – PlantUML Q&A
Lots of visual settings can be configured using skinparam as explained in [WayBack] Changing colors and fonts.
Even more advanced are
- [WayBack] templates/plantuml/class-diagram-tips.md – mark.george/templates: Controlling Class Lay-out as part of [WayBack] templates/plantuml at master – mark.george/templates and – next to many other tips – shows NodeSep and RankSep like in [WayBack] It is possible to decrease gab between elements – PlantUML Q&A
- [WayBack] PlantUML Pleasantness: Align Elements With Line Length – Messages from mrhaki (not 2 but 3 hyphens: –> into —> to push one level down); it has a few other nice more generic tips; see below.
- Some [WayBack] Class Diagram syntax and features can also be applied in [WayBack] Component Diagram syntax and features
Not sure I’m ready for this, as I have been living include file and macro nightmares in other environments: [WayBack] Use the preprocessor
[WayBack] PlantUML in a nutshell: Open-source tool that uses simple textual descriptions to draw UML diagrams.
You can add notes:
- to elements at a certain position (using note left of elementName, note right of ..., etc)
- the position is only applied when the note is within the same group as the element (otherwise the position is not taken into account)
- you cannot add notes to groups, but the first added note (not bound to any element) is usually close to the group name: [WayBack] Note at package not class – PlantUML Q&A [Archive.is]

[WayBack] Grouping and Positioning of Packages/Components: Having Issues – PlantUML Q&A: it is possible to link to/from packages, but their names need to be globally unique.

package PPP {
  [AAA]
  [BBB]
}
package QQQ {
  [CCC]
  [DDD]
}

' Linking between packages
PPP --> QQQ
'Linking a component to a package
AAA --> QQQ
'Linking a component to another component
AAA --> CCC

You can use UML2 style ([WayBack] Component Diagram syntax and features: components and interfaces look different),
but many people still like UML1 better:

UML2 style examples for skinparam that are equivalent:

skinparam component {
  Style uml2
}

skinparam {
  componentStyle uml2
}

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Posted in Development, Diagram, PlantUML, Software Development, UML | Leave a Comment »

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Archive for August 18th, 2020

Nick Hodges on SOLID in TypeScript using Angular

SOLID series with TypeScript using Angular

[WayBack] Angular 101 – Angles and Types

More Angular and TypeScript

DIID update

In the series “avoid Variants when coding in Delphi”: the comparison operator

Some PlantUML links I needed for complex component diagram editing

The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

Subscribe

Archives

Recent Comments

Recent Posts

Blog Stats

Meta title

Tag Cloud Title

Top Clicks

Top Posts

My badges

Twitter Updates

My Flickr Stream

Pages

All categories

Email Subscription

Archive for August 18th, 2020

Nick Hodges on SOLID in TypeScript using Angular

SOLID series with TypeScript using Angular

[WayBack] Angular 101 – Angles and Types

More Angular and TypeScript

DIID update

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In the series “avoid Variants when coding in Delphi”: the comparison operator

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Some PlantUML links I needed for complex component diagram editing

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