not_so_speedy_string_concat.ps1

Add-Type @'
public struct StringWrapper
{
  string s;
  
  public StringWrapper(string s){ this.s = s; }
  public void Add(string suffix)
  {
    s += suffix;
  }
  public void Concat(string suffix)
  {
    s = string.Concat(s, suffix);
  }
  public override string ToString()
  {
    return s;
  }
}
'@

# use a stopwatch to measure performance
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()

# create a string wrapper
$text = [StringWrapper]::new("")

# appending a string often 
# using foreach and avoiding the pipeline
foreach($_ in (1..100000))
{
    # replace operator += with Add():
    $text.Add("working on $_`r`n")
}

# check results:
$report = 'composed string of length {0} in {1:n2} seconds' 
$report -f $text.Length, $stopwatch.Elapsed.TotalSeconds

# use a stopwatch to measure performance
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()

# create a string wrapper
$text = [StringWrapper]::new("")

# appending a string often 
# using foreach and avoiding the pipeline
foreach($_ in (1..100000))
{
    # replace operator += with Add():
    $text.Concat("working on $_`r`n")
}

# check results:
$report = 'composed string of length {0} in {1:n2} seconds' 
$report -f $text.Length, $stopwatch.Elapsed.TotalSeconds