Sort array by dates in React JS

Question

I have an array of objects as follows :

let cars = [
    {"id":20,"mileage":41300,"make":"Golf", initialRegistration:"09/02/2010"}, 
    {"id":21,"mileage":51300,"make":"Passat", initialRegistration:"06/04/2012"},
    {"id":22,"mileage":61300,"make":"Audi", initialRegistration:"02/01/2018"},
    {"id":23,"mileage":20300,"make":"Touran", initialRegistration:"17/09/2013"},
    {"id":24,"mileage":10300,"make":"Polo", initialRegistration:"26/07/2014"}
];

And I want to sort it by initialRegistration.

I tried to do it as follows :

let sortedCars = cars.sort((a, b) => Date.parse(a.initialRegistration) - Date.parse(b.initialRegistration));

let sortedCars1 = cars.sort((a, b) => new Date(a.initialRegistration) - new Date(b.initialRegistration));

let sortedCars2 = cars.sort((a, b) => new Date(a.initialRegistration).getTime() - new Date(b.initialRegistration).getTime());

But none of these attempts did not work. The results that I get is :

Golf - 09/02/2010
Passat - 06/04/2012
Audi - 02/01/2018
Touran - 17/09/2013
Polo - 26/07/2014

Here is fiddle.

Answer 1

Use Date constructor and do something like this.

let sortedCars1 = cars.sort((a, b) => new Date(...a.initialRegistration.split('/').reverse()) - new Date(...b.initialRegistration.split('/').reverse()));

let cars = [{
  "id": 20,
  "mileage": 41300,
  "make": "Golf",
  initialRegistration: "09/02/2010"
}, {
  "id": 21,
  "mileage": 51300,
  "make": "Passat",
  initialRegistration: "06/04/2012"
}, {
  "id": 22,
  "mileage": 61300,
  "make": "Audi",
  initialRegistration: "02/01/2018"
}, {
  "id": 23,
  "mileage": 20300,
  "make": "Touran",
  initialRegistration: "17/09/2013"
}, {
  "id": 24,
  "mileage": 10300,
  "make": "Polo",
  initialRegistration: "26/07/2014"
}];

let sortedCars1 = cars.sort((a, b) => new Date(...a.initialRegistration.split('/').reverse()) - new Date(...b.initialRegistration.split('/').reverse()));

console.log(sortedCars1);

---

Or by string comparison using String#localeCompare after reversing the date string.

let sortedCars1 = cars.sort((a, b) =>
  a.initialRegistration.split('/').reverse().join().localeCompare(b.initialRegistration.split('/').reverse().join())); 

let cars = [{
  "id": 20,
  "mileage": 41300,
  "make": "Golf",
  initialRegistration: "09/02/2010"
}, {
  "id": 21,
  "mileage": 51300,
  "make": "Passat",
  initialRegistration: "06/04/2012"
}, {
  "id": 22,
  "mileage": 61300,
  "make": "Audi",
  initialRegistration: "02/01/2018"
}, {
  "id": 23,
  "mileage": 20300,
  "make": "Touran",
  initialRegistration: "17/09/2013"
}, {
  "id": 24,
  "mileage": 10300,
  "make": "Polo",
  initialRegistration: "26/07/2014"
}];

let sortedCars1 = cars.sort((a, b) =>
  a.initialRegistration.split('/').reverse().join().localeCompare(b.initialRegistration.split('/').reverse().join()));

console.log(sortedCars1);

Answer 2

Actually the date parsing was not happening correctly new Date("09/02/2010") will not work and will assume date to be 2nd sep 2010 hence it need sto be passed as "2010-02-09" yyyy-mm-dd

  let sortedCars = cars.sort((a, b) => Date.parse(new Date(a.initialRegistration.split("/").reverse().join("-"))) - Date.parse(new Date(b.initialRegistration.split("/").reverse().join("-"))));

See this http://jsfiddle.net/jwm6k66c/1590/