PSCustomObject[] vs Hashtables: The ultimate object smackdown
summary
Concrete numbers and demos decide: building maps for 10,000 fake users and matching 5,000 keys with naive Where-Object runs tens of seconds (≈30s), ForEach-Parallel cuts that to ~21s, a Break-on-find loop ≈15s, converting users to a List and removing hits finishes ~100ms, building a lookup Hashtable keyed by email finishes ≈70ms. Converting JSON to PSCustomObject is prettier but slightly slower than Hashtable conversion, creating PSCustomObjects with the type accelerator is ~68ms vs New-Object ~200ms per 1000 runs, and containskey vs -contains shows large perf differences. Output formatting, ordered hashtables, nesting, and a LINQ-style join also appear and work.
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chapters (9)
- 0:00Introduction
- 2:39PS objects vs hashtables
- 5:12Hashtables structure
- 11:34Creating PS objects
- 14:43Updating properties
- 21:03Output formatting
- 27:20Iterating through hashtables and PS objects
- 34:22Performance comparison
- 45:21Summary & Q&A
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