TypeScript迭代JSON并放入JSON元素

Question

I'm new to TypeScript but what I want to do is fairly simple but the documentation doesn't seem to cover iteration over JSON. What I want to do is iterate over a JSON response array and put a JSON object into each JSON element. Here's the code I'm working with, the TypeScript evaluator in WebStorm is telling me that speakerElement is a string and not JSON so I can't use the put function.

return new Promise(resolve => {
   this.http.get('http://.staging.wpengine.com/wp-json/wp/v2/cr3ativspeaker')
   .map(res => res.json())
.subscribe(data => {
  console.log("the speaker data is : ", data);
  console.log("the speaker data is : ", JSON.stringify(data));
  //get each speakers image and append it to their data
  for(let speakerElement in <JSON>data) {

    this.http.get('http://.staging.wpengine.com/wp-json/wp/v2/cr3ativspeaker')
      .map(res => res.json())
      .subscribe(response => {

       speakerElement.put("media_details", response.media_details);

      });

  }

  this.data = data;
  resolve(this.data);
});
});

Answer 1

Firstly, Everyone thanks for the suggestion. I found the answer which required a very small change. I was using in in my For Loop . I needed to use of . The correct code is

 for(let speakerElement of data) {
            console.log("Speaker element",speakerElement);// element is JSON 

          }