Very slow execution of for…in loop

Question

I am populating a spreadhsheet from data I am getting from an external endpoint. Everything is working, but the execution of the for...in loop is incredibly slow.

Th

Answer 1

I was not sure about //do something after complete. So how about these 2 patterns. Please think of this answer as one of several answers.

I modified your script to replace setValue() to setValues(). By this, the process speed will be fast.

Pattern 1 :

function getData1() {
  var sh = SpreadsheetApp.getActiveSheet();
  var response = UrlFetchApp.fetch(endpoint);
  var data = JSON.parse(response);
  var rates = data["quotes"];

  var keys = Object.keys(rates);
  var dat = [];
  keys.forEach(function(key){
    if (key != keys[keys.length - 1]) {
      dat.push([key.substring(3), rates[key]]);
    } else {
      //do something after complete
    }
  });
  sh.getRange(2, 1, dat.length, dat[0].length).setValues(dat);
}

Pattern 2 :

function getData2() {
  var sh = SpreadsheetApp.getActiveSheet();
  var response = UrlFetchApp.fetch(endpoint);
  var data = JSON.parse(response);
  var rates = data["quotes"];

  var dat = Object.keys(rates).map(function(key){return [key.substring(3), rates[key]]});
  sh.getRange(2, 1, dat.length, dat[0].length).setValues(dat);

  //do something after complete
}

Note :

• If this didn't work, can you provide a sample data from var response = UrlFetchApp.fetch(endpoint);? Of course, please remove the private information from it.

Refecences :

• setValue(value)
• setValues(values)
• Best Practices

If I misunderstand your question, I'm sorry.