nodeJS Promise.All挙動確認

test.js

'use strict';

/**
 * 指定した秒数ウエイトします。
 * @param {number} waitSec 秒数（ms）
 */
const _sleep = ( waitSec ) => {
  return new Promise( function ( resolve ) {
    setTimeout( function () { resolve(); }, waitSec );
  } );
};

const _errorhandler = ( e, message ) => {
  console.log( message );
  console.log( e.message );
  throw e;
};

const funcException = async ( val ) => {
  await _sleep( val * 1000 );
  try {
    throw new Error( `エラー:${ val }` );
  } catch ( e ) {
    console.log( "えらー：" + val );
    throw e;
  }
};
/**
 *  const objs = [...];
 *  await objs.forEachAsync(async (item) => {
 *      ...
 *      await someAsyncFunction();
 *      ...
 *  });
 *
 * @param {function} callback function(val, idx, obj)
 */

if ( !Array.prototype.forEachAsync ) {
  Array.prototype.forEachAsync = async function ( callback ) {
    for ( let index = 0; index < this.length; index++ ) {
      await callback( this[ index ], index, this );
    }
  };
}

const main = async () => {
  try {
    const dummyArray = [ 5, 2, 3 ];
    try {
      console.log( "Start" );

      await Promise.all( dummyArray.map( async ( val ) => {
        await funcException( val );
      } ) );

      /*
      await dummyArray.forEachAsync( async ( val ) => {
        await funcException( val );
      } );
      */
    } catch ( e ) {
      _errorhandler( e, "エラー発生！！" );
    }
    console.log( "正常終了" );
  } catch ( e ) {
    console.log( "異常終了" );
  }
};

main();