PowerShell: Hashtable: Get Key Value, Add Key, Remove Key

Get a Key's Value

By Index Operator: []

$dict = [ordered] @{"a" = 1; "b" = 2; }
$dict["a"]
# 1

By Member-Access Operator: .

If key is a string, you can use a property access operator form. 〔see PowerShell: Hashtable Key / Property Name Clash〕

$dict = [ordered] @{"a" = 1; "b" = 2; }
$dict.a
# 1

Add a Key, or Change a Key's Value

3 ways:

• hashtable.add(key,val) → functional form. Most precise.
• hashtable[key] = val → operator form.
• hashtable.key = val → property syntax form. Convenient, if no key clash with hashtable member names.

$dict = [ordered] @{"a" = 1; "b" = 2; }

$dict.add("c",3)

Write-Host $dict
# [a, 1] [b, 2] [c, 3]

$dict = [ordered] @{"a" = 1; "b" = 2; }

$dict["c"] = 3

Write-Host $dict
# [a, 1] [b, 2] [c, 3]

$dict = [ordered] @{"a" = 1; "b" = 2; }

$dict.c = 3

Write-Host $dict
# [a, 1] [b, 2] [c, 3]

Remove a Key

$dict = [ordered] @{"a" = 1; "b" = 2; }

$dict.remove("b")

Write-Host $dict
# [a, 1]