{"id":1047,"date":"2023-06-07T05:00:00","date_gmt":"2023-06-07T12:00:00","guid":{"rendered":"https:\/\/www.angulartraining.com\/daily-newsletter\/?p=1047"},"modified":"2023-06-04T19:24:31","modified_gmt":"2023-06-05T02:24:31","slug":"how-to-create-a-copy-of-anything-in-javascript","status":"publish","type":"post","link":"https:\/\/www.angulartraining.com\/daily-newsletter\/how-to-create-a-copy-of-anything-in-javascript\/","title":{"rendered":"How to create a copy of anything in Javascript?"},"content":{"rendered":"\n

Modern Javascript developers are used to the following syntax to create a copy of an object:<\/p>\n\n\n

let<\/span> copy = {...object};<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
While this approach works fine, it creates a shallow copy<\/a> of the object, not a fully-fledged clone that also duplicates nested objects and arrays.<\/p>\n\n\n\n
As a result, Javascript developers have learned another trick to perform a deep copy<\/a>:<\/p>\n\n\n
let<\/span> copy = JSON<\/span>.parse(JSON<\/span>.stringify(object));<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
The idea of this approach is to turn an object into a JSON string before parsing that string back into a brand-new object. It works, but it’s not elegant and looks like a hack.<\/p>\n\n\n\n
let<\/span> copy = structuredClone(object);<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n
<\/p>\n\n\n\n
If you need to support another browser, there is a polyfill implementation in core.js<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Modern Javascript developers are used to the following syntax to create a copy of an object: While this approach works fine, it creates a shallow copy of the object, not a fully-fledged clone that also duplicates nested objects and arrays. As a result, Javascript developers have learned another trick to perform a deep copy: The […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,20],"tags":[],"class_list":["post-1047","post","type-post","status-publish","format-standard","hentry","category-javascript","category-performance"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/1047","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/comments?post=1047"}],"version-history":[{"count":2,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/1047\/revisions"}],"predecessor-version":[{"id":1050,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/1047\/revisions\/1050"}],"wp:attachment":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/media?parent=1047"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/categories?post=1047"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/tags?post=1047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
The function is supported across all recent major browsers as shown on Can I use<\/a>:<\/p>\n\n\n
As a result, a better approach has been added to the Javascript language: the structuredClone<\/a><\/code> function. It’s a syntax improvement that creates deep clones efficiently:<\/p>\n\n\n