How to sort an array of objects in typescript?

Question

I'm trying to sort by distance of an array of json. I've tried using the .sort() function but I'm unable to make it work. I'm coding in typescript.

sortArr = [
{id: 1, distance: 2.56},
{id: 2, distance: 3.65},
{id: 3, distance: 9.25},
{id: 4, distance: 5.32},
{id: 5, distance: 2.56}
]

sortArr.distance.sort(function(a,b){return a-b;});

Answer 1

You almost got it right:

sortArr = [
{id: 1, distance: 2.56},
{id: 2, distance: 3.65},
{id: 3, distance: 9.25},
{id: 4, distance: 5.32},
{id: 5, distance: 2.56}
]

sortArr.sort(function(a,b){return a.distance-b.distance;});

Answer 2

You need to call sort on your array:

const array = [
  {id: 1, distance: 2.56},
  {id: 2, distance: 3.65},
  {id: 3, distance: 9.25},
  {id: 4, distance: 5.32},
  {id: 5, distance: 2.56}
];

const sorted = array.sort((a, b) => a.distance - b.distance);
console.log(sorted);

Though, sortArr.distance.sort(function(a, b) { return a-b; }); should at least show one error:

Property 'distance' does not exist on type '{ id: number; distance: number; }[]'.

Answer 3

sortArr.sort(function(a,b){return a['distance']-b['distance'];});