Variables hold a wide variety of information temporarily. The JavaScript data types that can be stored in a variable include: JavaScript variables can hold a few other kinds of data, but these are by ...

JavaScriptの変数の使い方と、ECMAScript 2015（ES6）で変わった点をコンパクトにおさらい。 JavaScriptを学ぶ基本の1つに、変数の使い方があります。変数は、number（数値）、string（文字列）、array（配列）など、あらゆる型（データ型を参照）を含む入れ物です。

JavaScript and TypeScript look very similar, but there's one important distinction. The key difference between JavaScript and TypeScript is that JavaScript lacks a type system. In JavaScript, ...