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128

Reversing an array of objects in Javascript

rated 0 times [ 135] [ 7] / answers: 1 / hits: 24719 / 6 Years ago, sun, august 19, 2018, 12:00:00

As the title says, I'd like to reverse an array made of objects in Javascript.

Example : var x = [{score:1},{score:2},{score:3}]

To do so, I'm using the .reverse() method.

Now, let's say I write this code

console.log(x);

x.reverse();

console.log(x);

I'm expecting the console to show the array in the original order, then in a reversed order. However, It really shows both arrays in the reversed order.

How come ?

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austonjuancarlosb

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answered 6 Years ago jacie · Accepted Answer

console.log() takes into account whether a mutable object has changed before it has been printed on the screen. And as your process of OUTPUT -> CHANGE -> OUTPUT is almost plesiochronous, both outputs are the same. You have to use a copy of x in order to get the prompt you need.

Try it this way:

// copy x

y = Object.assign({}, x);

console.log(y);



x.reverse();

console.log(x);