Find closest to the number inside array

Question

I have below array

const floorPerDayMilestones = [25, 50, 75, 100, 125, 150, 175, 200]

From the frontEnd user enters any number say it is

const number = 136

I need to find closest to the number but the lesser one. So the output should be 125

Even if the number is 149 the output should be 125

How can I do this. I tried many way but could get the answer.

Thanks!!!

Answer 1

If it's sorted in ascending order like in the question this should work.

const floorPerDayMilestones = [25, 50, 75, 100, 125, 150, 175, 200];
const number = 136;

function findClosest(arr, num) {
  for (let i = 0; i < arr.length; ++i) {
    if (arr[i] > num) {
      return arr[i - 1];
    }
  }
}

console.log(findClosest(floorPerDayMilestones,number));