daysOfWeekFinder.js

//
// Author: Jeff Pelton
// 

//
// PROMPT: https://podcastindex.social/@dave/105022919584538996
//
// Anybody want a code challenge?
// I'd like a script,function,method where I can pass it an array of unix timestamps and have it hand back an array of days of the week marking as true the days this podcast publishes episodes on.
// Like:
// findPublishDays([1602482305, 1602238118, ...])
// Might return: { 0: true, 1: false, 2: false, 3: false, 4: true, 5: false, 6: false }
// Where index 0 is Sunday. This would indicate that the podcast updates on Sunday and Thursday.
// If no pattern is found, return false.

//
// SOLUTION:
//
// Instead of returning an object with 7 keys, I've juse used an array with 7 indexes
// It could be optimized/abbreviated, but it might be useful to look at the number of occurences
//

let inputDates = [1602482305, 1602238118]

const findPublishDays = function(dates) {
    let daysOfWeekOccurences = [0, 0, 0, 0, 0, 0 ,0]
    dates.forEach(function(date){
        let d = new Date(date * 1000) // convert from seconds to ms
        daysOfWeekOccurences[d.getDay()]++;
    })
    let daysWithShow = daysOfWeekOccurences.map(function(x){
        return x > 0
    })
    return daysWithShow
}

console.log(findPublishDays(inputDates))