Copy const Items to an array

Question

I have constant elements array named items and want to copy it to arr2.

How to copy constantant elements array to another array?

I tried to use splice but it didn't work.

window.onload="rvalue()" var tempimages = []; var arr2=[]; function rvalue() { const items = [ { label: '1', url: '1.jpg' }, { label: '2', url: '2.jpg' }, { label: '3', url: '3.jpg' }, { label: '4', url: '4.jpg' }, { label: '5', url: '5.jpg' }, { label: '6', url: '6.jpg' }, { label: '7', url: '7.jpg' }, { label: '8', url: '8.jpg' }, { label: '9', url: '9.jpg' }, { label: '10', url: '10.jpg'}, { label: '11', url: '11.jpg'}, { label: '12', url: '12.jpg'}, ] ptags = document.querySelectorAll('[name="values"]'); arr2 = items.splice(0); for (let index = 0; index < 4;index++) { randomIndex = Math.floor(Math.random() * items.length),var item2[index]=['item.label','item']; var item2[index]=['item.label','item']; item = items[randomIndex]; ptags[index].textContent = item.label; tempimages.push(item); } console.log(item2); }

Possible duplicate of JavaScript: How to join / combine two arrays to concatenate into one array? — Calvin Nunes
– Calvin Nunes, Commented Sep 19, 2018 at 11:43
@calvin-nunes im not trying to concatenate 2 arrays, iwant to duplicate a conatant items named items — ironman
– ironman, Commented Sep 19, 2018 at 11:45
ok, but what is the problem with arr2 = arr2.concat(items) that is what the duplicate question have as answer? it works... you'll have arr2 with same values as items — Calvin Nunes
– Calvin Nunes, Commented Sep 19, 2018 at 11:47
Possible duplicate of How do you clone an Array of Objects in Javascript? — BeNdErR
– BeNdErR, Commented Sep 19, 2018 at 11:51

Michel Vorwieger · Accepted Answer · 2018-09-19 11:45:22Z

If you want to just copy them you can do:

const arr2 = [...items] https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Operators/Spread_syntax

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