Iterate through a range of dates in NodeJS

Question

I would like to iterate through a range of calender dates, each iteration is +1 day. I would use something built around JodaTime in Java - is there something similar in Node

Answer 1

As much as there are many utilities for this, they might be cumbersome to integrate into a useful loop to check against data.

This should do the trick. It might be overkill, but you could very easily make this more argument based.

var moment = require('moment');
var _ = require('lodash');

function(collectionsWithDateValues){
  var slots = [];
  var hours = {
    start: 7,   // 7am
    end: 21,    // 9pm
    window: 2   // How long each item should be slotted for.
  };
  var rightNow  = moment().add(0, 'days').hours(hours.start).minute(0).second(0);
  var cutoff    = moment(rightNow).add(14,'days'); // Check the next 2 weeks.
  for( rightNow ; rightNow.isBefore(cutoff) ; rightNow.add(hours.window, 'hours') ){
    // Check if we're going beyond the daily cutoff, go to the next day
    if(rightNow.isAfter(moment(rightNow).hour(hours.end))){
      rightNow.add(1, 'days').hour(hours.start);
    }
    var foundClash = false;
    _.forEach(collectionsWithDateValues,  function(item){
      // Check if the item is within now and the slotted time 
      foundClash = moment(item.date).isBetween(rightNow, moment(rightNow).add(hours.window, 'hours').subtract(1, 'minutes').seconds(59));
    });

    if(!foundClash){
      slots.push(rightNow.toString());
    }
  }
  return slots;
}