Closed 5 years ago. How do I clone/copy a Map in JavaScript? I know how to clone an array, but how do I clone/copy a Map?

Map.copyOf for creating a shallow copy, which is also immutable. (Here is its Javadoc). For a deep copy, as mentioned in this answer, you need some kind of value mapper to make a safe copy of …

120 I'm trying to copy the contents of a map ( amap ) inside another one (aSuperMap) and then clear amap so that it can take new values on the next iteration/loop. The issue is that you can't clear the …

Jun 19, 2015 · The problem you ran across is called aliasing. In order to break it for your case, you have to: define the clone method on your class ObjectA iterate over the keySet of the first map, thus: get …

Feb 3, 2015 · You're right that a shallow copy won't meet your requirements. It will have copies of the List s from your original map, but those List s will refer to the same List objects, so that a modification …

How do you copy a google My Maps map when there isn't a "copy" link in the legend? - Google Maps Community Help Center Community Google Maps ©2025 Google Privacy ...

Go 1.21 Same as below, but maps.Copy is now in the standard library, you can just use that instead of importing experimental packages or rolling your own. Go 1.18 Use the generic function maps.Copy …

Share your map on social media or website On your computer, sign in to My Maps. Find the map. At the top of the thumbnail, on the right, click Share . Select how you want to share your map. Follow the …

Jan 31, 2022 · map[:1 one:2 two:3] The values are assigned to different keys (different than in the source map), and one value is assigned to the empty string key in the first iteration (the default, zero …

Mar 21, 2021 · 1 You need to create a copy of the Field object (and, possibly, a copy of the Coordinate object too), instead of putting into a new map the same keys and values. How to create a copy of …