[Powershell] variable value is not retained

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  I'm new to Powershell.
  
  There is something that amazes me the way PS works, especially how it retains the variable.
  
  Example:
  
  

      [string]$a=""    
      $a = "world" $b = "Hello $a" write-host $b   
      $a = "world2" write-host $b

  
  
  
  The following is what is resulted:
  

      Hello world
      Hello world

  
  Why the second write-host does not display "Hello world2"?
  

  • Edited by te_ve Tuesday, October 24, 2017 3:17 AM Removed HTML tag
  • Moved by Bill_Stewart Thursday, January 25, 2018 9:52 PM Unanswerable drive-by question

  Tuesday, October 24, 2017 3:17 AM