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PowerShell Hash Tables: Syntax and Examples

A hash table stores values by name, like a small lookup table. You'll see them everywhere in PowerShell, from settings to parameters.

Create and read

Use @{ } with key = value pairs. Read a value with square brackets or dot notation.

$ages = @{ Ana = 31; Ben = 27 }
$ages['Ana']
$ages.Ben

Add, change, remove

Assigning to a new key adds it. Assigning to an existing key changes it. Remove takes the key out.

$ages['Cy'] = 40
$ages['Ben'] = 28
$ages.Remove('Ana')

Loop over it

GetEnumerator gives you each key and value pair.

$ages.GetEnumerator() | ForEach-Object { "$($_.Key) is $($_.Value)" }

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