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PowerShell: New-Object psObject

new-object psObject creates a hash like object.
The following example creates a new object with new-object. It turns out that the created type is a System.Management.Automation.PSCustomObject.
Two members are added (add-member). Finally, the added values are echoed with write-output. 
$psObj = new-object psObject

$psObj.getType().fullName
#
# System.Management.Automation.PSCustomObject

add-member -in $psObj noteProperty  greeting    'Hello world'
add-member -in $psObj noteProperty 'the number'  42

$psObj
#
# greeting    the number
# --------    ----------
# Hello world         42

write-output("I say " + $psObj.greeting)
#
# I say Hello world

write-output("The number is " + $psObj.'the number')
#
# The number is 42
Github repository about-PowerShell, path: /cmdlets/object/new/psObject/hash-like-object.ps1

Creating a custom object from a hash table

A hash table can be turned into a custom object like so: 
PS C:\> $hashTable = @{key_1 = 'foo'; key_2 = 'bar'; key_3 = 'baz' }
PS C:\> $hashTable

Name                           Value
----                           -----
key_1                          foo
key_3                          baz
key_2                          bar

PS C:\> $hashTable | get-member -memberType properties

   TypeName: System.Collections.Hashtable

Name           MemberType Definition
----           ---------- ----------
      …
Keys           Property   System.Collections.ICollection Keys {get;}
      …
Values         Property   System.Collections.ICollection Values {get;}

PS C:\> $custObj   = new-object psObject -property $hashTable
PS C:\> $custObj

key_1 key_3 key_2
----- ----- -----
foo   baz   bar

PS C:\> $custObj | get-member -memberType properties

   TypeName: System.Management.Automation.PSCustomObject

Name  MemberType   Definition
----  ----------   ----------
key_1 NoteProperty string key_1=foo
key_2 NoteProperty string key_2=bar
key_3 NoteProperty string key_3=baz
It is even simpler (and as some sources on the internet seem to claim also faster) to use the [psCustomObject] type accelerator: 
PS C:\> $anotherObj = [psCustomObject] @{ K1 = 'one'; K2 = 'two'; K3 = 'three' }

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