How to generate the array of time durations - node.js

Question

I'm trying to create an array of time durations in a day with 15 minute intervals with moment.js and ES6.
Example: let time_duration= ["15 Min", "30 Min",..., "1 hr 15 min", "1 hr 30 min"]

Answer 1

I think it supposed to work:
generateTimeDurations(minutesGap: number, length: number): string[] {
const result = Array(length).fill(null);
let acc = 0;
return result.map(_ => {
acc += minutesGap;
if (acc >= 60) {
return `${Math.floor(acc / 60)} hr ${acc % 60} min`;
} else {
return `${acc} min`;
}
});
}

Answer 2

If you only need static time levels like "15 Min", "30 Min" and so on you could try to do it in plain JS with Array#fill and Array#map.
const hours = 24;
const minutes = 24 * 60;
function minsToHM(totalMins) {
let padZero = value => String(value).padStart(2, "0");
totalMins = Number(totalMins);
const h = Math.floor(totalMins / 60);
const m = Math.floor(totalMins % 60);
const hDisplay = h > 0 ? padZero(h) + (h == 1 ? " Hour" : " Hours") : "";
const mDisplay = m > 0 ? padZero(m) + (m == 1 ? " Min" : " Mins") : "";
return `${hDisplay}${h > 0 && m > 0 ? ", ": ""}${mDisplay}`;
}
function splitHours(hours, difference) {
const mins = hours * 60;
return Array(Math.floor(mins / difference))
.fill(1)
.map((_, idx) => (idx+1) * difference)
}
const output = splitHours(1.5, 15).map(i => minsToHM(i))
console.log(output)
.as-console-wrapper { max-height: 100% !important; top: 0px }

Answer 3

console.clear();
function digitToMinute(digit) {
return digit * 60 / 100;
}
function minutesToDigit(minute) {
return minute * 100 / 60;
}
function digitsToHourAndMinutes(digit) {
return [Math.floor(digit / 60), digitToMinute(getFraction(digit / 60))];
}
function getFraction(f) {
return Math.ceil(((f < 1.0) ? f : (f % Math.floor(f))) * 100)
}
function getIntervals(max) {
var intervals = [];
var span = 15;
var i = 0;
while (i <= max) {
if (i > 0) {
let [hour, minute] = digitsToHourAndMinutes((i));
let string = [];
if (hour > 0) {
string.push(hour + ' hour');
}
if (minute > 0) {
string.push(minute + ' minutes');
}
intervals.push(string.join(' '));
}
i = i + span;
}
return intervals;
}
console.log(getIntervals(60 * 5));