how can i dynamically update my nested object within another object, within an array?

Question

I have an array and inside each array is a json object with each day of the week, so my array would look something like this:

var array = [
    {
        "wednesday":{
            "notes":"some notes for Wednesday"
        },
    },
    {
        "thursday":{
            "notes":"some notes for Thursday"
        }
    }
];

i can get away with updating my object directly by calling the following:

array[0].wednesday.notes = "updating Wednesday notes";

However, I need to update it dynamically....

I have a function that looks something like this, I need to dynamically call the day of the week on my json object and not be locked into just wednesday, i need to be able to call wednesday, thursday, friday etc on my object, how can i do this?

function updateObject(index, empNum) {
    console.log(index+", "+empNum)
    array[index].employee = $("#employee_" + empNum).val();
    array[index].wednesday.notes = $("#employee_" + empNum + "_wed_notes").val();
    array[index].wednesday.start = $("#employee_" + empNum + "_wed_shift_start").val();
    array[index].wednesday.lunch = $("#employee_" + empNum + "_wed_lunch").val();
    array[index].wednesday.end = $("#employee_" + empNum + "_wed_shift_end").val();
    array[index].wednesday.short_day = $("#employee_" + empNum + "_wed_short_day").is(':checked');
    array[index].wednesday.lack_of_work = $("#employee_" + empNum + "_wed_lack_of_work").is(':checked');
    array[index].wednesday.full_day = $("#employee_" + empNum + "_wed_full_day").is(':checked');

    var row_count = $("input[id*='employee_" + empNum + "_wed_job_']").length;
    for (var i = 0; i < row_count; i++) {
      var data = {};
      data.job = $("input[id*='employee_" + empNum + "_wed_job_']").eq(i).val();
      data.hrs = $("input[id*='employee_" + empNum + "_wed_hrs_']").eq(i).val();
      data.cost_code = $("input[id*='employee_" + empNum + "_wed_cost_code_']").eq(i).val();
      data.st = $("input[id*='employee_" + empNum + "_wed_st_']").eq(i).is(':checked');
      data.ot = $("input[id*='employee_" + empNum + "_wed_ot_']").eq(i).is(':checked');
      data.dt = $("input[id*='employee_" + empNum + "_wed_dt_']").eq(i).is(':checked');
      array[index].wednesday.data[i] = data;
    }
  }

i tried something like doing array[index].[thursday].notes = "x";

but unfortunately that doesnt work, i need to be able to call the day of the week i need when i call the function

so i need it to be something like updateObject(2,1,"thursday");

Answer 1

You just need to use the bracket notation to access the correct element in your array/objects.

This function would let you enter the week number (array index) as well as the day you want to update.

 var array = [ { "wednesday":{ "notes":"some notes for Wednesday" }, }, { "thursday":{ "notes":"some notes for Thursday" } } ]; function updateArray(index, day, newNotes) { array[index][day].notes = newNotes; } console.log('before', array); updateArray(1, 'thursday', 'updated notes'); console.log('after', array); 

Answer 2

You can access all your data as so:

const updateObject = (index, empNum) => {
  const i = array[index], k = Object.keys(i)[0]
  if (!k) {return console.error("Invalid Data at index",index)}
  i[k].notes = `Whatever you want with ${empNum}`
}

The function isolates the key given at a certain location and accesses it.

Example: updateObject(0, "15 employees")

If you would rather have ^^ do it by day then your function would look like:

const updateObject = (day, empNum) => {
  const i = array.map(r => {
    const k = Object.keys(r)[0];if (!k) {return false}
    return r[k]
  }).filter(r => r)[0]
  if (!i) {return console.error("Invalid Day [%s] provided",day)}
  i.notes = `Whatever you want with ${empNum}`
}

Not you can use it like: updateObject('tuesday', "15 employees")