Multiline String, Remove Duplicate Lines

// GraalJS Script (engine type: 2)

//////// START "main()" ////////////////////////////////////////////////////////////////
main();
function main(){ 

//// == Config Retrieving / 工程コンフィグの参照 ==
const strInput         = configs.get      ( "StrConfA1" );    /// REQUIRED
  if( strInput       === "" ){
    throw new Error( "\n AutomatedTask ConfigError:" +
                     " Config {A1: String} is empty \n" );
  }
const boolReverseMode  = configs.getObject( "BoolConfB1" );   /// TOGGLE
  // https://questetra.zendesk.com/hc/ja/articles/360024574471-R2300 "Boolean object"
  if( boolReverseMode ){ // true
    engine.log( " AutomatedTask Config: Reverse order Search");
  }else{
    engine.log( " AutomatedTask Config: Forward order Search");
  }

const strPocketOutput  = configs.getObject( "SelectConfC1" ); // NotRequired
const strPocketRemoved = configs.getObject( "SelectConfC2" ); // NotRequired


//// == Data Retrieving / ワークフローデータの参照 ==
// (Nothing. Retrieved via Expression Language in Config Retrieving)


//// == Calculating / 演算 ==
const arrInput     = strInput.split( '\n' );

let   arrOutput    = [];
let   arrRemoved   = [];
let   setUniqKeys  = new Set();
// The Set object lets you store unique values of any type. Require ES2015(ES6)
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
// https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Set

if ( boolReverseMode ) {
  arrInput.reverse(); // [ "line0", "line1", "line2" ] ⇒ [ "line2", "line1", "line0" ]
}
for ( let i = 0; i < arrInput.length; i++ ) {
  let strKey = arrInput[i];
  // engine.log( " AutomatedTask StrKey: " + strKey );
  if ( setUniqKeys.has ( strKey ) ) {
    // engine.log( " AutomatedTask SetUniqKeys has: " + strKey + " (line: " + i + ")" );
    arrRemoved.push ( strKey );
  } else {
    arrOutput.push  ( strKey );
    setUniqKeys.add ( strKey );
  }
}
if ( boolReverseMode ) {
  if ( arrOutput.length !== 0 ){
       arrOutput.reverse(); // [ "line2", "line1", "line0" ] ⇒ [ "line0", "line1", "line2" ]
  }
  if ( arrRemoved.length !== 0 ){
       arrRemoved.reverse();
  }
}

let strOutput  = arrOutput?.join( '\n' ) ?? "";
let strRemoved = arrRemoved?.join( '\n' ) ?? "";
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining


//// == Data Updating / ワークフローデータへの代入 ==
if ( strPocketOutput !== null ) {
  engine.setData ( strPocketOutput,  strOutput );
}
if ( strPocketRemoved !== null ) {
  engine.setData ( strPocketRemoved, strRemoved );
}

} //////// END "main()" /////////////////////////////////////////////////////////////////



/*
Notes:
- When the process reaches the automated step, the "Multiline text" will be automatically evaluated.
    - In Forward mode, the first occurrence of a row is retained.
    - And the second and subsequent occurrences are deleted.
- If the "Output Text" is empty, the string type data item is updated with empty characters.
- If the "delete line" is empty, the string type data item is updated with an empty string.
Appendix-en:
- In computer science, a `Set` is an abstract data type:
    - that can store unique values, without any particular order.
    - It is a computer implementation of the mathematical concept of a finite set.
    - https://en.wikipedia.org/wiki/Set_(abstract_data_type)
    - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set

Notes-ja:
- 案件が自動工程に到達した際、「複数行テキスト」が評価されます。
    - 正順モード（Forward mode）の場合、最初に出現した行が保持され、2回目以降に出現する行は削除されます。
- もし「出力テキスト」が空の場合、文字列型データ項目は、空文字で更新されます。
- もし「削除行」が空の場合、文字列型データ項目は、空文字で更新されます。
Appendix-ja:
- `Set` とは、コンピュータプログラミングで用いられる抽象データ型の一種。
    - 順序のないデータの集まり（有限集合）を表現する抽象データ型。
    - 同一のデータは一つしか含まれないことが保証される。
    - https://w.wiki/6DCr
    - https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Set
*/