CODEWITHSUNDEEP
javascriptsyntax
IGE DAMILOLA
IGE DAMILOLA

Reputation: 53

Does JavaScript have tuples?

I would love to know if there are python type tuples in JavaScript. I am working on a project and I need to just use a list of objects rather tan an array.

Upvotes: 5

Views: 16969

Answers (6)

dashingdove
dashingdove

Reputation: 435

JavaScript does not have native tuples, but you could possibly roll your own. For example:

class Tuple extends Array {

    constructor(...args) {
        super();
        this.push(...args);
        Object.seal(this);
    }
    
}

The tuple in this case is essentially just an array, but because it's sealed you cannot add or remove elements from it, so it will act like a tuple.

You can then create tuples like this:

let t = new Tuple(1,2)

Upvotes: 0

fatih-erikli
fatih-erikli

Reputation: 39

There are no tuples in javascript. It returns the last evaluated value when a tuple is expressed in javascript.

const value = (1, 2, 3);
// value is three

I have no idea why it exists though.

Upvotes: 1

shaedrich
shaedrich

Reputation: 5735

The closest to a tuple is using Object.seal() on an array which is initiated with the wanted length:

let arr = new Array(1, 0, 0);
let tuple Object.seal(arr)

Otherwise, you can use a Proxy:

let arr = [ 1, 0, 0 ];
let tuple = new Proxy(tuple, {
    set(obj, prop, value) {
        if (prop > 2) {
            throw new RangeError('this tuple has a fixed length of three');
        }   
    }
});

Update: There is an ECMAScript proposal for a native implementation of a Tuple type

Upvotes: 6

Emmanuel Spencer Egbuniwe
Emmanuel Spencer Egbuniwe

Reputation: 486

No Javascript doesn't have tuples so my advise will be to use an array of fixed size as a default tuple or maybe as an object which has the same properties as "named" tuples. Tuples are only created using arrays

Upvotes: 0

Swiss bobo
Swiss bobo

Reputation: 301

Sometimes it's just better to answer question directly without prolonging it with but you can but it can,

This should be more helpful for someone like me.

Does javascript have tuples type built in like ones in python?

Answer: No, tuples are not native types in javascript. Period.

Upvotes: -4

Swati Srivastava
Swati Srivastava

Reputation: 1157

Javascript does not support a tuple data type, but arrays can be used like tuples, with the help of array destructuring. With it, the array can be used to return multiple values from a function. Do

function fun()
{
    var x, y, z;
    # Some code
    return [x, y, z];
}

The function can be consumed as 

[x, y, z] = fun();

But, it must be kept in mind that the returned value is order-dependent. So, if any value has to be ignored, then it must be destructured with empty variables as

[, , x, , y] = fun();

Upvotes: 8

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