Filter array of users with age unrder 30 and sort it in JavaScript

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I just start to learn JS. So, I need your help. How can I use Array.sort() with my code?

I have an array:

var users = [{
      first_name: "Brithany",
      last_name: "Allison",
      birthday: "1993-11-13",
  },
  {
      first_name: "Sonya",
      last_name: "Slowers",
      birthday: "1967-02-21",
  },
  {
      first_name: "Ashley",
      last_name: "Pratt",
      birthday: "1987-11-10",
  }
];

I need to receive all users under 30. I can sort by birthday, but I don't understand how to receive users under 30 years

There is my code:

users.sort(function(a, b){
    var dateA=new Date(a.birthday), dateB=new Date(b.birthday)
    return dateA-dateB 
})

You can use the Array filter method and filter out anyone who is greater than 30 years old. The following code should get you there.

Note that getTime returns the time since January 1, 1970 in milliseconds.

var users = [{
      first_name: "Brithany",
      last_name: "Allison",
      birthday: "1993-11-13",
  },
  {
      first_name: "Sonya",
      last_name: "Slowers",
      birthday: "1967-02-21",
  },
  {
      first_name: "Ashley",
      last_name: "Pratt",
      birthday: "1987-11-10",
  }
];

const under30 = users.filter(user => {
  const ageInSeconds = new Date().getTime() - new Date(user.birthday).getTime();
  return ageInSeconds < 30 * 365 * 86400 * 1000;
})

console.log(under30);

Array methods, The arr.splice(start) method is a swiss army knife for arrays. name : "Mary" } ] ; // returns array of the first two users let someUsers = users . filter ( item The call to arr.sort() sorts the array in place, changing its element order. age : 30 } ; let mary = { name : "Mary" , age : 28 } ; let users = [ john , pete , mary ]� var newArray = array.filter(function(item) { return condition; }); The item argument is a reference to the current element in the array as filter() checks it against the condition. This is useful for accessing properties, in the case of objects. If the current item passes the condition, it gets sent to the new array. Filtering an array of objects

There are few steps what you need to do to achieve the goal:

  1. Calculate the day when you have the limit for under 30 years, the function named getBirthdayLimit will do the job for this purpose.
  2. Then applying a simple filter will help you to return only the users who are in the condition of new Date(user.birthday) > birthdayLimit.

So I would do the following:

const users = [
  {
    first_name: "Brithany",
    last_name: "Allison",
    birthday: "1993-11-13",
  },
  {
    first_name: "Sonya",
    last_name: "Slowers",
    birthday: "1967-02-21",
  },
  {
    first_name: "Ashley",
    last_name: "Pratt",
    birthday: "1987-11-10",
  }
];

const getBirthdayLimit = () => {
  const d = new Date();
  const year = d.getFullYear();
  const month = d.getMonth();
  const day = d.getDate();
  return new Date(year - 30, month, day);
};

const birthdayLimit = getBirthdayLimit();
console.log('The birthday limit', birthdayLimit);

const under30 = users.filter((user) => (new Date(user.birthday) > birthdayLimit));

console.log(under30);

JavaScript Array Filter: Filtering Array Elements Based on a Test , This tutorial shows you how to use the JavaScript array filter method to filter Inside the function, we checked if the population of the each city in the array is a new array, you can chain the result with other iterative methods such as sort() and let data = [10, 20, "30", 1, 5, 'JavaScript filter', undefined, 'example']; let range� Summary: in this tutorial, you will learn how to use the JavaScript Array filter() method to filter elements in an array. Introduction to JavaScript array filter() method. One of the most common tasks when working with an array is to create a new array that contains a subset of elements of the original array.

So, Sort will sort your objects, and the syntax looks good. Now, if you want to conditionally leave some objects in the array, you need .filter() method.

Example:

var usersBelowThirty = users.filter(u => new Date(u.birthday) < new Date(new Date().setFullYear(new Date().getFullYear() - 30)))

This is a one liner, if you want to be elegant, i would assign two variables in the linq block and do the following:

var userBday = new Date(u.birthday);
var thirtyYearsAgo = new Date().setYear(new Date().getYear() - 30);
return userBday < thirtyYearsAgo;

Good luck with future endevours and welcome to the Programming world ;)

Filters an array of objects with multiple match-criteria. � GitHub, `function filterArray<TInput = any>(array: TInput[], filters: IFilters) => TInput[]` filterArray.test.js details: details => details.length < 30 && details.width >= 70,. }; Filter array using different data types (better for user error) let users: any = [ { name: 'John', email: 'johnson@mail.com', age: 28, nation: 'USA' }, { name: 'Marlin', � The caveat here is that we’re not actually filtering using React. Filter is a JavaScript function that we can perform on an array type object. Remember, we use JavaScript to write React. None of these methods are special to React. React is just the UI library. Example 1: Filter an Array of Strings in React. This first example is quite a

Writing better, functional Javascript with map, filter and reduce, Writing better, functional Javascript with map, filter and reduce I have an array of users, and I want to change the age John to 23. age: 30, gender: 'f'}, ] const newUsers = users.map(user => user.id === 1 ? For this one we start with an empty object {} . users .slice() .sort((a, b) => a.name > b.name). Since we don’t want to change our original list, we are going to use a high order function named filter, which will return a new filter array based in a predicate (function) we pass to it. The predicate will compare the index of the current keyword in the original list with its index in the new list and will push it to the new array only if

Understanding the Sort Method of Arrays, For the above code, the expected result is [1,2,11], but we get [1,11,2]. The reason is the The JavaScript array sort() is used to sort array elements. 1: { name: "Antony", age: 33}users.sort(sortByName);//output0: {name: "Antony", age: 33} var array = [3,2,1, 110, 102 , 30];function customCompare(a, b){ //output: "Over 30: Joe" const subscribe = example . subscribe ( val => console . log ( `Over 30: ${ val . name } ` ) ) ; Example 3: filter for number greater than specified value

JavaScript Array filter() Method, Return an array of all the values in the ages array that are 18 or over: var ages Note: filter() does not execute the function for array elements without values. If you have an array of objects that you need to sort into a certain order, you might be tempted to reach for a JavaScript library. But before you do, remember that you can do some pretty neat

Sugar - Home, A Javascript utility library for working with native objects. A number of native Javascript array methods such as filter accept "matching functions" which match� by Alex Permyakov. How to simplify your codebase with map(), reduce(), and filter() in JavaScript Photo by Anders Jildén on Unsplash. When you read about Array.reduce and how cool it is, the first and sometimes the only example you find is the sum of numbers.

Comments
  • try to get their age then you sort Arrays.
  • In addition to this, I would suggest using filter first then sort, less iterations in that case