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specに関するjay-esのブックマーク (7)
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jay-es 2024/06/22
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`structuredClone()`: deeply copying objects in JavaScript
Spreading is a common technique for copying objects in JavaScript: Spreading into an Array literal to copy an Array Spreading into an Object literal to copy a plain object Spreading has one significant downside – it creates shallow copies: The top levels are copied, but property values are shared. structuredClone() is a new function that will soon be supported by most browsers, Node.js and Deno. I
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The CanIUse Embed
Embed up-to-date data from caniuse.com and mozilla's browser compat data. Displays feature support data for multiple versions of the 10 major browsers. Configurable, reliable, and fully responsive. Tweet Made with by @IreAderinokun Examples The embed can be used in several forms. Interactive Embed By default, the interactive embed will display the feature support for the current version, 1 version
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CSS Nesting Module
CSS Nesting Module W3C Working Draft, 14 February 2023 More details about this document This version: https://www.w3.org/TR/2023/WD-css-nesting-1-20230214/ Latest published version: https://www.w3.org/TR/css-nesting-1/ Editor's Draft: https://drafts.csswg.org/css-nesting/ History: https://www.w3.org/standards/history/css-nesting-1 Feedback: CSSWG Issues Repository Inline In Spec Editors: Tab Atkin
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An amazing error message if you put more than 2^24 items in a JS Map object
An amazing error message if you put more than 2^24 items in a JS Map object One of the fun things about working with big data is that you can often hit weird limits with a system. I was personally trying to load every "common" single nucleotide polymorphism for the human genome into memory (dbSNP), of which there are over 37 million entries (there are many more uncommon ones) Turns out, you may ru
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