将数组中的任何 null 或虚假值转换为空白字符串 "" 值 Javascript

Question

I did an API get request and put the results in an array. Some of the results may come back undefined or null - later in the script I need to pass along the values as strings - so if there is no value I need it to pass along as a "" string value. But how can I loop through the array and make sure that any non-value values are stored as a string with "" ?

var dealresponse = UrlFetchApp.fetch(dealurl, options);
  dealresponse = JSON.parse(dealresponse.getContentText());

  var propertyAddress = dealresponse.data["9bd1d8c4f07f5795fd8bffb16f3b63c6547d7d3a"];
  var leadType = dealresponse.data["c4ecbe01c3494d1be52432f4a3194ede3a50c0f8"];  
  var dealType = dealresponse.data["a4269fb4730cf7fd1787752be94eacbc4b0de24e"];
  var dealSource = dealresponse.data["d76fa2d6f8454a51f7d64d981cd9320877bc2ea0"];

var dealArray = [propertyAddress, leadType, dealType, dealSource];  
  Logger.log(dealArray);

I'd like to process dealArray at the end and just make sure blanks are actual "" string values. I don't want to delete or remove these values from the object, I just want to convert anything falsy to a string "" (I believe that "" is considered falsy in and of itself)

Answer 1

If you have no other falsy values than undefined or null , you could take a logical OR ||

dealArray = dealArray.map(v => v || '')

Otherwise take a Nullish coalescing operator ?? .

dealArray = dealArray.map(v => v ?? '')

Answer 2

One approach is looping throught the array,

 var dealArray = [propertyAddress, leadType, dealType, dealSource];
 const result = dealArray.map((deal) => deal ? deal: "");

Another approach is, initialize to empty if the value is not present.

 var propertyAddress = dealresponse.data["9bd1d8c4f07f5795fd8bffb16f3b63c6547d7d3a"] || '';
  var leadType = dealresponse.data["c4ecbe01c3494d1be52432f4a3194ede3a50c0f8"] || '';  
  var dealType = dealresponse.data["a4269fb4730cf7fd1787752be94eacbc4b0de24e"] || '';
  var dealSource = dealresponse.data["d76fa2d6f8454a51f7d64d981cd9320877bc2ea0"] || '';
  var dealArray = [propertyAddress, leadType, dealType, dealSource];