sort by boolean value

Question

I have array of following class

export class Tests {
  id: number;
  name: string;
  createdAt: any;
  succress: boolean;

  constructor(id: number, name: string, createdAt: any, success: boolean) {
    this.id = id;
    this.name = name;
    this.createdAt = createdAt;
    this.succress = success;
  }
}

And I want to sort it by value of success (false on top and true on bottom). How can I do that?

I've tried

this.tests.sort((a,b)=> b.succress - a.succress);

But is not doing anything

Dieterg · Accepted Answer · 2019-09-09 05:57:46Z

4

You can sort by boolean value as follows:

this.tests.sort((a, b) => {
   if (a.succress === b.succress) {
      return 0;
   }

   if (a.succress) {
      return -1;
   }

   if (b.succress) {
      return 1;
   }
});

edited Sep 9, 2019 at 5:57

answered Nov 10, 2017 at 15:12

Dieterg

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1 Comment

HMR Over a year ago

Nitpicking here but would it not be more correct to first check if a === b return 0 if a === true return -1 then return 1. Now when a and b are the same it would return 1 or -1 which is incorrect.

HMR · Accepted Answer · 2017-11-10 16:04:10Z

1

Maybe something like this?

[false,true,false,true]
.sort(
  (a,b)=>
    (a===b)?0
    :(a===true)?1:-1)

edited Nov 10, 2017 at 16:04

answered Nov 10, 2017 at 15:18

HMR

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Comments

Aravind · Accepted Answer · 2017-11-10 15:16:45Z

0

You can easily achieve this using lodash sortBy function

_.sortBy(this.users,['succress'])

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answered Nov 10, 2017 at 15:16

Aravind

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