Essays
These are full-blown essays, papers, and articles.

Presentations
Slideshows and presentation materials from conferences.

Interviews and Panels
Reprints of non-game-specific interviews, and transcripts of panels and roundtables.

Snippets
Excerpts from blog, newsgroup, and forum posts.

Laws
The "Laws of Online World Design" in various forms.

Timeline
A timeline of developments in online worlds.

A Theory of Fun for Game Design
My book on why games matter and what fun is.

Insubstantial Pageants
A book I started and never finished outlining the basics of online world design.

Links
Links to resources on online world design.

All contents of this site are
© Copyright 1998-2010
Raphael Koster.
All rights reserved.

The views expressed here are my own, and not necessarily endorsed by any former or current employer.

Powershell 3 Cmdlets Hackerrank Solution Free

Report: PowerShell 3 Cmdlets - HackerRank Solution Analysis

Date: October 26, 2023 Subject: Analysis and Solution Strategy for the "PowerShell 3 Cmdlets" Challenge

Some developers write PowerShell like C#: powershell 3 cmdlets hackerrank solution

$result = New-Object System.Collections.ArrayList
for ($i=0;$i -lt $arr.Length;$i++) 
    if ($arr[$i] % 2 -eq 0)  $result.Add($arr[$i])

But PowerShell shines with cmdlets:

$result = $arr | Where-Object  $_ % 2 -eq 0

The latter is:

HackerRank judges don't care about micro-optimizations; they care about correctness. Cmdlet pipelines reduce bugs. Report: PowerShell 3 Cmdlets - HackerRank Solution Analysis

Selects ProcessName and Id as-is.
Creates a calculated property WorkingSet_MB:
- Divides WorkingSet (bytes) by 1 MB to convert to MB.
- [math]::Round() rounds to 2 decimal places.

If the challenge asks, "Which cmdlet is used to [do action]?", you need to search the system. But PowerShell shines with cmdlets : $result =

Example: If you need a cmdlet to get a process:

Get-Command -Noun Process
# Output suggests: Get-Process, Stop-Process, etc.