Singleline String, Set One Line from Multiline Randomly

// GraalJS Script (engine type: 2)

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

//// == Config Retrieving / 工程コンフィグの参照 ==
const strCandidateLines    = configs.get( "StrConfA" );          /// REQUIRED ///////////
  if( strCandidateLines  === "" ){
    throw new Error( "\n AutomatedTask ConfigError:" +
                     " Config {A: String} is empty \n" );
  }
const strExclusionPatterns = configs.get( "StrConfB" );          //  not required ///////
const strPocketExtracted   = configs.getObject( "SelectConfC" ); /// REQUIRED ///////////


//// == 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 ==
let arrExclusionPatterns = strExclusionPatterns.split("\n"); // empty returns [ '' ]
let arrCandidateLines = strCandidateLines.split("\n");

let arrCandidateLinesExcluded = [];
for( let i = 0; i < arrCandidateLines.length; i++ ){
  if( arrCandidateLines[i] === "" ){
    arrCandidateLinesExcluded.push( arrCandidateLines[i] );
    continue;
  }
  let boolMatch = false;
  for( let j = 0; j < arrExclusionPatterns.length; j++ ){
    if( arrExclusionPatterns[j] === "" ){ break; }
    if( arrCandidateLines[i].includes( arrExclusionPatterns[j] ) ){
      boolMatch = true;
      break;
    }
  }
  if( ! boolMatch ){
    arrCandidateLinesExcluded.push( arrCandidateLines[i] );
  }
}

if( arrCandidateLinesExcluded.length === 0 ){
  throw new Error( "\n AutomatedTask UnexpectedStringError:" +
                   " Population is Zero \n" );
}

let numRand = Math.floor( Math.random() * arrCandidateLinesExcluded.length );
engine.log( " AutomatedTask numSeq: " + numRand +
            " (" + arrCandidateLinesExcluded.length + ")" );
let strExtracted = arrCandidateLinesExcluded[ numRand ];


//// == Data Updating / ワークフローデータへの代入 ==
engine.setData( strPocketExtracted, strExtracted );


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

/*
Notes:
- When the process reaches the automated task, one line in the multiline string is extracted.
    - If the multiline string contains a blank line, a blank line (empty string) may be extracted.
    - If you want to delete blank lines in advance, place an Automated Task upstream.
        - Multiline String, Delete Empty Lines
        - https://support.questetra.com/ja/addons/multiline-string-delete-empty-lines-2021/
- Please set the exclusion setting (detection pattern) for each line: multiple patterns can be set.
    - If no the exclusion setting (detection pattern), one line is extracted from all candidate lines.
    - If a blank line is set in the exclusion setting (detection pattern), it will be ignored.

APPENDIX:
- The random number generation depends on `Math.random()` (JavaScript).
    - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random

Notes-ja:
- 案件がこの自動処理工程に到達した際、複数行文字列（候補行リスト）内の一行を自動的に抽出します。
    - 空行を含む複数行文字列の場合、空行（空文字列）が抽出される可能性があります。
    - あらかじめ空行を削除しておきたい場合、上流に自動削除工程を配置します。
        - 複数行文字列, 空行の削除
        - https://support.questetra.com/ja/addons/multiline-string-delete-empty-lines-2021/
- 除外設定（検出文字パターン）は、各行に設定してください（複数のパターンを設定できます）
    - 除外設定（検出文字パターン）が未設定の場合、全ての候補行から一行抽出されます。
    - 除外設定（検出文字パターン）に空行が設定された場合、無視されます。

APPENDIX-ja:
- 乱数の生成分布は `Math.random()` (JavaScript) に依存します。
    - https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Math/random
*/