Generate array of times (as strings) for every X minutes in JavaScript

Question

I\'m trying to create an array of times (strings, not Date objects) for every X minutes throughout a full 24 hours. For example, for a 5 minute interval the arr

Answer 1

Loops are unnecessary in this case.

ES6

//Array.from, only supported by Chrome 45+, Firefox 32+, Edge and Safari 9.0+
//create an array of the expected interval
let arr = Array.from({
  length: 24 * 60 / 5
}, (v, i) => {
  let h = Math.floor(i * 5 / 60);
  let m = i * 5 - h * 60;
  //convert to 12 hours time
  //pad zero to minute
  if (m < 10) {
    m = '0' + m;
  }
  let label = 'AM';
  if (h > 12) {
    label = 'PM';
    h -= 12;
  }
  if (h === 0) {
    h = 12;
  }
  return h + ':' + m + ' ' + label;
});

document.body.textContent = JSON.stringify(arr);

Wider browser support

var arr = Array.apply(null, {
  length: 24 * 60 / 5
}).map(function(v, i) {
  var h = Math.floor(i * 5 / 60);
  var m = i * 5 - h * 60;
  if (m < 10) {
    m = '0' + m;
  }
  var label = 'AM';
  if (h > 12) {
    label = 'PM';
    h -= 12;
  }
  if (h === 0) {
    h = 12;
  }
  return h + ':' + m + ' ' + label;
});

document.body.textContent = JSON.stringify(arr);