order by truthiness

Question

order by truthiness

I am working with an array of the 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;
  }
}

My goal is to sort the array based on the value of the success property (false should be on top and true on bottom). How can I achieve this?

I attempted the following:

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

However, this code is not having any effect. Can anyone help me figure out the issue?

angular typescript

Answer 1

Answer №1

To sort by a boolean value, you can use the following method:

this.items.sort((x, y) => {
   if (x.completed === y.completed) {
      return 0;
   }

   if (x.completed) {
      return -1;
   }

   if (y.completed) {
      return 1;
   }
});

Answer 2

To sort by a boolean value, you can use the following method:

this.items.sort((x, y) => {
   if (x.completed === y.completed) {
      return 0;
   }

   if (x.completed) {
      return -1;
   }

   if (y.completed) {
      return 1;
   }
});

Answer 3

Answer №2

Perhaps this could work?

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

Answer 4

Perhaps this could work?

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

Answer 5

Answer №3

If you want to sort a list based on a specific key, you can make use of the powerful lodash sortBy function.

_.sortBy(this.data, ['priority'])

For a live demonstration, check out this LIVE DEMO.

Answer 6

If you want to sort a list based on a specific key, you can make use of the powerful lodash sortBy function.

_.sortBy(this.data, ['priority'])

For a live demonstration, check out this LIVE DEMO.

order by truthiness

Answer №1

Answer №2

Answer №3

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