Problem creating time slots in JavaScript

Question

I am going to create time slots of two hours each.

start_time=10:00
end_time=24:00

Like [ [10:00,12:00], [12:00,14:00], [14:00,16:00] ] ...

I am using that function:

function calculate_time_slot(start_time, end_time, interval = "120") {
    var i, formatted_time;
    var time_slots = new Array();
    for (var i = start_time; i <= end_time; i = i + interval) {
        formatted_time = convertHours(i);
        time_slots.push(formatted_time);
    }
    return time_slots;
}

but it produce results like this:

[
  '10:00', '12:00',
  '14:00', '16:00',
  '18:00', '20:00',
  '22:00', '24:00'
]

How to make the pairing like the desired results like:

[ [10:00,12:00], [12:00,14:00], [14:00,16:00] ] ...

CertainPerformance · Accepted Answer · 2020-03-20 09:38:54Z

1

Inside the loop, calculate two formatted times: one for the start of the slot, and one for the end of the slot:

function calculate_time_slot(startTime, endTime, interval = 120) {
  const timeSlots = [];
  for (let i = startTime; i < endTime; i += interval) {
    const formattedBegin = convertHours(i);
    const formattedEnd = convertHours(i + interval);
    timeSlots.push([formattedBegin, formattedEnd]);
  }
  return timeSlots;
}

Make sure to set interval to a number, not a string, so that you add instead of concatenate.

edited Mar 20, 2020 at 9:38

answered Mar 20, 2020 at 5:52

CertainPerformance

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3 Comments

Tony Zhao Over a year ago

Brilliant, Thanks for the help

Tony Zhao Over a year ago

Is there any way to compare two arrays like [2020-03-19, 12:30,14:00] and [2020-03-19, 12:00,14:00] and the result should be true, but as of now it is not a match but contains the similar time

Penny Liu Over a year ago

@CertainPerformance You may need to return timeSlots; instead of return time_slots;.

Penny Liu · Accepted Answer · 2020-03-20 08:48:30Z

1

You can use reduce() in the calculate_time_slot function like so:

let time_slots = ["10:00", "12:00", "14:00", "16:00", "18:00", "20:00", "22:00", "24:00"];

time_slots = time_slots.reduce((acc, cur, i, arr) => {
  if (i < arr.length - 1) {
    acc.push([`${cur}`, `${arr[i + 1]}`]);
  }
  return acc;
}, []);

console.log(time_slots);

edited Mar 20, 2020 at 8:48

answered Mar 20, 2020 at 8:42

Penny Liu

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