How to create a Hash Table in PowerShell?

There are several ways to create a Hash Table in PowerShell. We will discuss here the standard method @{} for creating the Hash Table.

Using @{} Method

You can use @{} method to create a hash table. Key-Value pair is separated with the Semi-Colon (;). You can only add unique keys. Duplicate keys are not accepted.

$htable = @{EmpName="Charlie";City="New York";EmpID="001"}

Output

Name       Value
----       -----
EmpID      001
City       New York
EmpName    Charlie

Here, you will not get the output in an ordered fashion. To get the ordered output, you need to write [Ordered] ahead of the Hash table. For Example,

$htable = [Ordered]@{EmpName="Charlie";City="New York";EmpID="001"}

Output

PS C:\WINDOWS\system32> $htable

Name       Value
----       -----
EmpName    Charlie
City       New York
EmpID      001

To access only Hash table keys, you can use the below command.

$htable.Keys

Output

PS C:\WINDOWS\system32> $htable.Keys
EmpName
City
EmpID

To access only Hash table values,

$htable.Values

Output

PS C:\WINDOWS\system32>$htable.Values
Charlie
New York
001

You can access the individual Key as well. To access the Employee Name (Key:EmpName), you need to use the below command.

$htable["EmpName"]

Output

PS C:\WINDOWS\system32> $htable["EmpName"]
Charlie

You can also access the same value with the Dot (.) method as shown below.

$htable.EmpName

Similarly, you can access different values by using respective keys.

To get the multiple values, use multiple keys.

$htable["EmpName","EmpID"]

Output

PS C:\WINDOWS\system32> $htable["EmpName","EmpID"]
Charlie
001