async-await-7.js

class Foo {
 
  async getData() {
    try {
      const f1 = await this.fakeAsyncCall();
      const f2 = await this.fakeAsyncCall();
      const f3 = await this.fakeAsyncCall();
      const f4 = await this.fakeAsyncCall();
   
      console.log(f1, f2, f3, f4); // 'foo data' x 4
    
    } catch (error) {
      console.error(`Uh oh: ${error}`);
    }
  }
  
  fakeAsyncCall(resultText = 'foo data') {
    return new Promise((resolve, reject) => {
      if (typeof resultText !== 'string') {
        return reject('result text should equal string');
      }
      setTimeout(() => { resolve(resultText) }, 1000);
    });
  }
  
}

new Foo().getData();