Advanced JavaScript Archives https://openjavascript.info/category/advanced-javascript/ Learn the language of the web. Sun, 05 Feb 2023 19:41:34 +0000 en-US hourly 1 https://wordpress.org/?v=6.4.2 https://openjavascript.info/wp-content/uploads/2023/12/cropped-android-chrome-192x192-1-32x32.png Advanced JavaScript Archives https://openjavascript.info/category/advanced-javascript/ 32 32 What is a Blob object in JavaScript? https://openjavascript.info/2022/10/17/what-is-a-blob-object-in-javascript/ https://openjavascript.info/2022/10/17/what-is-a-blob-object-in-javascript/#respond Mon, 17 Oct 2022 07:50:57 +0000 https://openjavascript.info/?p=6051 A Blob object is used for accessing, encoding and transferring files and file-like objects.

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]]> https://openjavascript.info/2022/10/17/what-is-a-blob-object-in-javascript/feed/ 0 How to save and retrieve images from localStorage https://openjavascript.info/2022/10/11/how-to-save-and-retrieve-images-from-localstorage/ https://openjavascript.info/2022/10/11/how-to-save-and-retrieve-images-from-localstorage/#respond Tue, 11 Oct 2022 05:27:50 +0000 https://openjavascript.info/?p=6005 You can use the FileReader API to create a data URL and pass this through localStorage.

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]]> https://openjavascript.info/2022/10/11/how-to-save-and-retrieve-images-from-localstorage/feed/ 0 How to create and decode a query string in JavaScript https://openjavascript.info/2022/10/10/how-to-create-and-decode-a-query-string-in-javascript/ https://openjavascript.info/2022/10/10/how-to-create-and-decode-a-query-string-in-javascript/#respond Mon, 10 Oct 2022 09:35:08 +0000 https://openjavascript.info/?p=5986 A query string is used to store string data as part of a URL.

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]]> https://openjavascript.info/2022/10/10/how-to-create-and-decode-a-query-string-in-javascript/feed/ 0 How to read and display a PDF using JavaScript https://openjavascript.info/2022/08/31/how-to-read-and-display-a-pdf-using-javascript/ https://openjavascript.info/2022/08/31/how-to-read-and-display-a-pdf-using-javascript/#respond Wed, 31 Aug 2022 06:03:12 +0000 https://openjavascript.info/?p=5581 The native FileReader API can be used to read a PDF and create a URL to its contents.

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]]> https://openjavascript.info/2022/08/31/how-to-read-and-display-a-pdf-using-javascript/feed/ 0 A guide to using localStorage and sessionStorage https://openjavascript.info/2022/06/29/save-data-to-the-browser-with-localstorage-and-sessionstorage/ https://openjavascript.info/2022/06/29/save-data-to-the-browser-with-localstorage-and-sessionstorage/#respond Wed, 29 Jun 2022 08:05:09 +0000 https://openjavascript.info/?p=4856 localStorage and sessionStorage objects allow you to store data from to user's browser.

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]]> https://openjavascript.info/2022/06/29/save-data-to-the-browser-with-localstorage-and-sessionstorage/feed/ 0 map() vs forEach() https://openjavascript.info/2022/06/21/map-vs-foreach/ https://openjavascript.info/2022/06/21/map-vs-foreach/#respond Tue, 21 Jun 2022 08:47:28 +0000 https://openjavascript.info/?p=4677 The map() and forEach() methods both iterate through arrays, but are not interchangeable.

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]]> https://openjavascript.info/2022/06/21/map-vs-foreach/feed/ 0 Understanding JavaScript closures with simple examples https://openjavascript.info/2022/05/06/understanding-javascript-closures-with-simple-examples/ https://openjavascript.info/2022/05/06/understanding-javascript-closures-with-simple-examples/#respond Fri, 06 May 2022 07:58:30 +0000 https://openjavascript.info/?p=4199 A JavaScript closure is a function that has its own protected, 'private' variables.

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]]> https://openjavascript.info/2022/05/06/understanding-javascript-closures-with-simple-examples/feed/ 0 A very simple introduction to JavaScript modules https://openjavascript.info/2021/09/27/an-introduction-to-javascript-modules-setup-for-cross-browser-compatibility/ https://openjavascript.info/2021/09/27/an-introduction-to-javascript-modules-setup-for-cross-browser-compatibility/#respond Mon, 27 Sep 2021 05:01:10 +0000 https://openjavascript.info/?p=803 Learn how to better organise code using reusable JavaScript modules.

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]]> https://openjavascript.info/2021/09/27/an-introduction-to-javascript-modules-setup-for-cross-browser-compatibility/feed/ 0 Filter an existing array to make a new one using filter() https://openjavascript.info/2021/09/24/keep-array-elements-you-want-only-with-the-filter-method/ https://openjavascript.info/2021/09/24/keep-array-elements-you-want-only-with-the-filter-method/#respond Fri, 24 Sep 2021 04:48:24 +0000 https://openjavascript.info/?p=958 Create a new array including only certain elements from an existing array using filter()

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]]> https://openjavascript.info/2021/09/24/keep-array-elements-you-want-only-with-the-filter-method/feed/ 0 Make array calculations with the reduce() method https://openjavascript.info/2021/09/23/a-simple-guide-to-using-the-reduce-method/ https://openjavascript.info/2021/09/23/a-simple-guide-to-using-the-reduce-method/#respond Thu, 23 Sep 2021 13:52:25 +0000 https://openjavascript.info/?p=906 Reduce the values of an array to a single number with reduce()

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