# Finding minimum time difference in an array in JavaScript

JavascriptWeb DevelopmentFront End Technology

## Problem

We are required to write a JavaScript function that takes in an array of 24-hour clock time points in "Hour:Minutes" format. Our function should find the minimum minutes difference between any two time points in the array.

For example, if the input to the function is −

const arr = ["23:59","00:00"];

Then the output should be −

const output = 1;

Because the minimum difference between the times is 1 minute

## Example

Following is the code −

Live Demo

const arr = ["23:59","00:00"];
const findMinDifference = (arr = []) => {
const find = (str = '') => str.split(':').map(time => parseInt(time, 10))
const mapped = arr.map((time) => {
const [hour1, minute1] = find(time)
return hour1 * 60 + minute1
});
const sorted = []
let isrepeating = false
mapped.forEach((time) => {
if (sorted[time] !== undefined || sorted[time + 24 * 60] !== undefined) {
isrepeating = true
}
sorted[time] = time
sorted[time + 24 * 60] = time + 24 * 60
})
if (isrepeating) {
return 0
}
let min = Infinity
let prev = null
for (let i = 0; i < sorted.length; i++) {
if (sorted[i] !== undefined) {
if (prev) {
min = Math.min(min, sorted[i] - prev)
}
prev = sorted[i]
}
}
return min
};
console.log(findMinDifference(arr));

## Output

Following is the console output −

1