Attempting to eliminate any dates that have already occurred

Question

Attempting to eliminate any dates that have already occurred

I am faced with an array containing various dates in string format such as "2016-08-12". My goal is to eliminate any dates that have already passed by comparing them to today's date. I am using TypeScript for this task.

Here is a snippet of my datoArray:

["2016-08-02", "2016-08-11", "2016-08-22", "2016-09-10"]

and so on...

Below is the logic I am attempting to apply:

for(var i = 0; i < this.datoArray.length; i++){
    this.skoleAar = parseInt(this.datoArray[i].slice(0,4))
    this.skoleMaaned = parseInt(this.datoArray[i].slice(5,8))
    this.skoleDag = parseInt(this.datoArray[i].slice(8,10))

        if(this.skoleAar < currentYear){
            this.datoArray.splice(i, 1);
        }
        if(this.skoleAar == currentYear && this.skoleMaaned < currentMonth){
            this.datoArray.splice(i, 1);
        }
        if(this.skoleAar == currentYear && this.skoleMaaned == currentMonth && this.skoleDag < currentDay){
            this.datoArray.splice(i, 1);
        }
    }

The variables, `currentYear`, `currentMonth`, and `currentDay` are obtained from another function. When logged, they show integer values like 2016 for the year and 8 for the month when extracted from the start of the array. For `currentYear`, `currentMonth`, and `currentDay`, it displays 2016, 11, 20 respectively, representing today's year, month, and day all as integers. However, despite these comparisons of integer values, the conditions inside the "if" statements do not seem to work as expected. It appears there may be an issue with the way I am performing the comparisons. As far as I understand, this should be the correct way to compare integer values, so I am puzzled as to why the logic is failing?

javascript typescript

Answer 1

Answer №1

To filter dates in ISO-8601 format, you can utilize the Date.parse() method.

var dates = ["2016-08-02", "2016-08-11", "2016-08-22", "2016-09-10", "2016-12-15"];

function excludePreviousDates(data) {
  var today = new Date();
  console.log('Initial state: ' + data);
  var updated = dates.filter(function(dateString) {
    return Date.parse(dateString) >= today;
  });
  console.log('Final state: ' + updated);
  return updated;
}

var filteredDates = excludePreviousDates(dates);

Answer 2

To filter dates in ISO-8601 format, you can utilize the Date.parse() method.

var dates = ["2016-08-02", "2016-08-11", "2016-08-22", "2016-09-10", "2016-12-15"];

function excludePreviousDates(data) {
  var today = new Date();
  console.log('Initial state: ' + data);
  var updated = dates.filter(function(dateString) {
    return Date.parse(dateString) >= today;
  });
  console.log('Final state: ' + updated);
  return updated;
}

var filteredDates = excludePreviousDates(dates);

Answer 3

Answer №2

It appears that your date values are in compliance with RFC standards, which means they can be directly used in a new Date object. To filter these dates based on their relation to the current date, you can compare them to today:

var today = new Date()
var futureDates = this.datoArray.filter(d => new Date(d) >= today)

(for pre-ECMA6:)

var today = new Date()
var futureDates = this.datoArray.filter(function (d) {
  return new Date(d) >= today;
})

Answer 4

It appears that your date values are in compliance with RFC standards, which means they can be directly used in a new Date object. To filter these dates based on their relation to the current date, you can compare them to today:

var today = new Date()
var futureDates = this.datoArray.filter(d => new Date(d) >= today)

(for pre-ECMA6:)

var today = new Date()
var futureDates = this.datoArray.filter(function (d) {
  return new Date(d) >= today;
})

Answer 5

Answer №3

In my opinion, the issue does not seem to be related to the dates.

It appears that the problem arises when trying to delete items from the array while simultaneously iterating through the same array.

One possible solution could be to iterate through the array in reverse order or keep track of the indexes that need to be removed before actually deleting them. It's important to remember that removing an item will shift the index of all remaining items - starting with the highest index might help avoid confusion.

Answer 6

In my opinion, the issue does not seem to be related to the dates.

It appears that the problem arises when trying to delete items from the array while simultaneously iterating through the same array.

One possible solution could be to iterate through the array in reverse order or keep track of the indexes that need to be removed before actually deleting them. It's important to remember that removing an item will shift the index of all remaining items - starting with the highest index might help avoid confusion.

Attempting to eliminate any dates that have already occurred

Answer №1

Answer №2

Answer №3

Similar questions

Trouble with jquery/ajax form submission functionality

Is there a way to continuously click on a button 99 times or until the code finishes running?

Set maximum size for background image in div

Merging HTML Array with jQuery

Using @carbon/react in conjunction with Next.js version 13 leads to unconventional styling

AngularJs stops the link from being clicked more than once

Utilizing JSDoc annotations for type safety in VSCode with ESLint configuration for TypeScript declarations import

A guide on implementing isomorphic types in TypeScript

Alert: Route.get() is requesting a callback function, but is receiving an [object Undefined] while attempting multiple exports

Place a hook following the storage of a variable in the device's memory

AngularJS factory or filter failing to update properly

Set up Vue.prototype prior to the component loading

How can one determine the most accurate box-shadow values?

Using knex.js to pipe data to an express server

It is not possible to retrieve a cookie via a request

What steps can I take to troubleshoot the 'Uncaught DOMException: failed to execute add on DOMTokenList' error?

Retrieve input value in Angular 8 using only the element's ID

Best practices for managing JWT tokens on the front-end with fetch requests and secure storage methods

What are some ways to manipulate JSON data following a successful AJAX request?

What is the process for incorporating multiple HTML pages into an Ionic hybrid mobile application?