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async-await.js

try {
  const resumes = await this.getResumes();

  if (resumes.length > 0) {
    this.setState({
      resume: await this.getResume(resumes[0])
    });
  }
} catch(error) {
  console.error(error);
} finally {
  this.setState({isLoading: false});
}

promise chain.js

this.getResumes()
  .then(resumes => {
    if (resumes.length > 0) {
      return this.getResume(resumes[0]).then(resume => this.setState({resume}));
    }
  })
  .catch(error => console.error(error))
  .finally(() => this.setState({isLoading: false}));