ES6（ECMAScript 2015）は、2015年にJavaScriptに革新的な変化をもたらした重要なアップデートです。従来のJavaScriptと比べて、より簡潔で読みやすく、保守性の高いコードを書けるようになりました。 本記事では、ES6で導入された主要な文法機能を実践的なサンプル ...

Let’s first take a look at the definitions on MDN: forEach() — executes a provided function once for each array element. map() — creates a new array with the results of calling a provided function on ...

JavaScript, the cornerstone of web development, has undergone significant transformations since its inception. The introduction of ECMAScript 6 (ES6), also known as ECMAScript 2015, marked a pivotal ...

If you’re a developer, you’ve probably heard a little bit about ECMAScript 6 (ES6) already, though at first glance it might seem a little confusing. What it really boils down to is this: it’s the next ...

ArrayMap is a ES6 Map-like object designed for use where arrays are needed to act as map keys by array-values rather than array identity for example ArrayMap has an identical set of available methods ...

ECMAScriptとは標準規格のことで、その6番目のバージョンがES6。 それを実装したものがJavaScript。 ざっくりいうとES6は次世代JavaScript 90年代はver1〜ver3、ver4は内部的な事情があり正式には策定されなかった。ver5（2008年）、ver5.1（2011年）がほとんどのブラウザで ...

Your browser does not support the audio element. When I started writing JavaScript before 4 years, things were totally different. We use jQuery a lot, use script and ...