Calculate the intersection (and difference) of two 1D text waves

//**
// Calculates the intersection of two 1D text waves.
//
// @param wave1
//  First 1D text wave.
// @param wave2
//  Second 1D text wave.
// @param resultWave
//  A text wave where the result will be stored.  This wave will be overwritten if it already contains
//  any data.
// @param rejectWave
//  [OPTIONAL]  A text wave where all values that are in the shorter of wave1 and wave 2 but
//  not in the longer are stored.  Providing this parameter allows you to determine both which
//  values are present in both waves and which are not.  NOTE:  rejectWave will NOT contain
//  values that are present in the longer of the two waves but not in the shorter.
//*
Function CalculateTextWaveIntersection(wave1, wave2, resultWave, [rejectWave])
    WAVE/T wave1
    WAVE/T wave2
    WAVE/T resultWave
    WAVE/T rejectWave
   
    Variable processRejects
    if (ParamIsDefault(rejectWave))
        processRejects = 0
    else
        processRejects = 1
    endif
 
    Variable wave1Rows = DimSize(wave1, 0)
    Variable wave2Rows = DimSize(wave2, 0)
    Variable longRows, shortRows
    if (wave1Rows > wave2Rows)
        Duplicate/O/T wave1, longWave
        WAVE/T shortWave = wave2
        longRows = wave1Rows
        shortRows = wave2Rows
    else
        Duplicate/O/T wave2, longWave
        WAVE/T shortWave = wave1
        longRows = wave2Rows
        shortRows = wave1Rows
    endif
 
    // Sort values in longWave
    Sort longWave, longWave
    Redimension/N=(0) resultWave
 
    Variable n, numOutRows, longWaveRow, rejectRows
    For (n=0; n<shortRows; n+=1)
        FindValue/TEXT=shortWave[n]/TXOP=4 longWave
        longWaveRow = V_Value
        if ((longWaveRow) >= 0 && cmpstr(longWave[longWaveRow], shortWave[n]) == 0)
            Redimension/N=(numOutRows + 1) resultWave
            resultWave[numOutRows] = shortWave[n]
            numOutRows += 1
        elseif (processRejects)
            rejectRows = DimSize(rejectWave, 0)
            Redimension/N=(rejectRows + 1) rejectWave
            rejectWave[rejectRows] = shortWave[n]
        endif
    EndFor
    KillWaves/Z longWave
End