JavaScript's .sort() method works in simulator but not on iOS device

I am trying to sort a list of events by date using JavaScript’s built in .sort() method. I am using a ListView to display the data. In dataSource.cloneWithRows() I pass in a function that is supposed to return a sorted array of events. For some reason this works fine in the simulator but doesn’t work on my iOS device. Any help is appreciated!

[ademars94]

@mkraft If your issue has to do with sorting dates, you’re in luck.

Originally, I was trying to directly compare two JS Date objects here:

// this code exists in a loop, see earlier post
if (new Date(arr[j - 1].startDateTime) > new Date(arr[j].startDateTime)) { 
  //fun stuff in here
}

And since the different runtime environments handle dates differently, it was breaking.

Definitely take a look at the Moment.js library. I am using Moment to make sure the formats stay consistent when comparing dates and when I’m hopping between the dev server and static JS bundle.

So this line:

let aDate = moment(array[j - 1].startDateTime, moment.ISO_8601);

Will give me back the startDateTime (which is a JS Date object), formatted as Moment’s .ISO_8601 format. Now I can compare dates all day long until my fingers fly off.

Here’s my updated block o’ code 4 reference:

sortByDate = (array) => {
    for (let i = array.length - 1; i >= 0; i--) {
      for (let j = 1; j <= i; j++) {
        // Use moment to format dates before they are compared
        let aDate = moment(array[j - 1].startDateTime, moment.ISO_8601);
        let bDate = moment(array[j].startDateTime, moment.ISO_8601);
        if (aDate > bDate) {
          let temp = array[j - 1];
          array[j - 1] = array[j];
          array[j] = temp;
        }
      }
    }
    return array;
  };

[halaharr]

Hi, I am having same issue. I am trying to sort contacts and show in FlatList. It works in simulator but when I publish the app for testing on devices it does not sort. Here is my sample code. Please let me know if you guys were able to solve this issue.

    phoneContacts.slice.sort((a, b) => {
      const aName = (a.buttonTitle === '+Add' ? '0' : '1') + a.firstName.toLowerCase();
      const bName = (b.buttonTitle === '+Add' ? '0' : '1') + b.firstName.toLowerCase();
      if (aName < b.bName) return -1;
      if (aName > bName) return 1;
      return 0;
    });

Thanks