Discover each *distinct arrangement* from a given array

I'm looking to generate unique combinations of element positions in a JavaScript array.

Here's the array I am working with: 

var places = ['x', 'y', 'z'];

The combinations I want are: [0,1], [0,2], [1,2].

Currently, I am using the following code which is functional but slightly cumbersome: 

for (var i = 0; i < places.length; i++) {
    for (var j = 0; j < places.length; j++) {
        if ((j > i) && (j != i)) { 
            console.log(i, j);
        }
    }
}

Is there a cleaner or more efficient way to achieve this?

javascriptarrayspermutation

Answer №1

// This code snippet is sourced from codecademy.com

var guests = ["Emma", "Finn", "Grace", "Henry", "Ivy"];
var totalGuests = guests.length;
var x, y;

for(x = 0; x < totalGuests; x++){
    for(y = x + 1; y < totalGuests; y++){
        console.log(guests[x] + ", " +  guests[y]);
    }
}

// expected output
Emma, Finn
Emma, Grace
Emma, Henry
Emma, Ivy
Finn, Grace
Finn, Henry
Finn, Ivy
Grace, Henry
Grace, Ivy
Henry, Ivy

Answer №2

To simplify your code, you may begin j at i + 1 instead and remove the need for the if statement.

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