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Ilya Kantor 2021-12-13 18:29:36 +03:00
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1-js/02-first-steps/05-types/article.md
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@ -248,7 +248,7 @@ The last three lines may need additional explanation:
3. The result of `typeof alert` is `"function"`, because `alert` is a function. We'll study functions in the next chapters where we'll also see that there's no special "function" type in JavaScript. Functions belong to the object type. But `typeof` treats them differently, returning `"function"`. That also comes from the early days of JavaScript. Technically, such behavior isn't correct, but can be convenient in practice. 3. The result of `typeof alert` is `"function"`, because `alert` is a function. We'll study functions in the next chapters where we'll also see that there's no special "function" type in JavaScript. Functions belong to the object type. But `typeof` treats them differently, returning `"function"`. That also comes from the early days of JavaScript. Technically, such behavior isn't correct, but can be convenient in practice.
```smart header="The `typeof(x)` syntax" ```smart header="The `typeof(x)` syntax"
You may also come across another syntax in some code: `typeof(x)`. It's the same as `typeof x`. You may also come across another syntax: `typeof(x)`. It's the same as `typeof x`.
The parentheses here aren't a part of the `typeof` operator. It's the kind of parentheses used for mathematical grouping. Usually, such parentheses contain a mathematical expression, such as `(2 + 2)`, but here they contain only one argument `(x)`. Syntactically, they allow to avoid a space between the `typeof` operator and its argument, and some people like it. The parentheses here aren't a part of the `typeof` operator. It's the kind of parentheses used for mathematical grouping. Usually, such parentheses contain a mathematical expression, such as `(2 + 2)`, but here they contain only one argument `(x)`. Syntactically, they allow to avoid a space between the `typeof` operator and its argument, and some people like it.