Selecting arbitrary elements from an array to generate a fresh array

Question

Selecting arbitrary elements from an array to generate a fresh array

I am working on a project where I need to select three random values from an array and display them in a new array on my website. It is important that each value is only selected once.

Here is what I currently have:

 var students = ["Hans", "Ole", "Nils", "Olav", "Per", "Knut", "Line", "Pia"];
 var pick = students[Math.floor(Math.random() * students.length)];

I am considering adding an id to my HTML so that the new array can be displayed on the website, but I am uncertain about the next steps.

javascript arrays

Answer 1

Answer №1

To achieve a random sorting, first shuffle the order and then select the top three items:

student
   .sort(function(){
       return Math.random() - 0.5;
     })
   .slice(0,3)

The reason for subtracting 0.5 from Math.random() is because the sort function expects positive or negative values to determine order, but Math.random() generates values between 0 and 1 by default. By subtracting 0.5, we introduce negative values which allow for proper sorting.

Answer 2

To achieve a random sorting, first shuffle the order and then select the top three items:

student
   .sort(function(){
       return Math.random() - 0.5;
     })
   .slice(0,3)

The reason for subtracting 0.5 from Math.random() is because the sort function expects positive or negative values to determine order, but Math.random() generates values between 0 and 1 by default. By subtracting 0.5, we introduce negative values which allow for proper sorting.

Answer 3

Answer №2

If you want to randomly select students in a loop, you can try the following approach:

var students = ["Hans","Ole","Nils","Olav","Per","Knut","Line","Pia"];
var randomStudents = [];
for(var i = 0; i < 3; i++) {
    var pick = students[Math.floor(Math.random() * students.length)];
    randomStudents.push(pick);
}

Keep in mind that this method may result in duplicate entries in the array. To prevent duplicates, you should check if the student is already included in the array before adding them.

You can achieve this using recursion.

https://www.example.com/random-student-selection

Answer 4

If you want to randomly select students in a loop, you can try the following approach:

var students = ["Hans","Ole","Nils","Olav","Per","Knut","Line","Pia"];
var randomStudents = [];
for(var i = 0; i < 3; i++) {
    var pick = students[Math.floor(Math.random() * students.length)];
    randomStudents.push(pick);
}

Keep in mind that this method may result in duplicate entries in the array. To prevent duplicates, you should check if the student is already included in the array before adding them.

You can achieve this using recursion.

https://www.example.com/random-student-selection

Selecting arbitrary elements from an array to generate a fresh array

Answer №1

Answer №2

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