powershell Powershell函数与lodash _.merge的工作方式类似地合并Hashtables。回答问题“如何合并几个哈希表

Posted 2021-05-22

<#  .SYNOPSIS
      Merges any number of hashtables into one

    .DESCRIPTION
      Merges any number of hashtables taken both from pipeline and arguments, with the hashtables in the right overwriting the keys with the same names from hastables in the left

    .EXAMPLE
      $a = @{a = 'a1'; b = 'a2'}
      $b = @{b = 'b1'; c = 'b2'}
      $c = @{c = 'c1'; d = 'c2'}

      PS> Merge-Hashtables $a $b

      Name                  Value                                                                                                                                                              
      ----                  -----
      a                     a1
      b                     b1
      c                     b2

    .EXAMPLE
      PS> $a, $b | Merge-Hashtables $c

      Name                  Value                                                                                                                                                              
      ----                  -----
      a                     a1
      b                     b1
      c                     c1
      d                     c2  
#>

Function Merge-Hashtables {
    $Result = @{}
    ($Input + $Args) | 
        Where   { ($_.Keys -ne $null) -and ($_.Values -ne $null) -and ($_.GetEnumerator -ne $null) } | 
        ForEach { $_.GetEnumerator() } | 
        ForEach { $Result[$_.Key] = $_.Value } 
    $Result
}