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Update type-of-function.md and primitive-data-types.md #205

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Update type-of-function.md
Jan 29, 2021
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Update primitive-data-types.md
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Update type-of-function.md
Jan 29, 2021
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2 changes: 1 addition & 1 deletion basics/primitive-data-types.md
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Expand Up @@ -2,7 +2,7 @@

JavaScript 的类型分为两种：原始数据类型（[Primitive data types][]）和对象类型（Object types）。

原始数据类型包括：布尔值、数值、字符串、`null`、`undefined` 以及 ES6 中的新类型 [`Symbol`][] 和 [`BigInt`][]。
原始数据类型包括：布尔值、数值、字符串、`null`、`undefined` 以及 ES6 中的新类型 [`Symbol`][] 和 ES10 中的新类型 [`BigInt`][]。

本节主要介绍**前五种**原始数据类型在 TypeScript 中的应用。

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4 changes: 2 additions & 2 deletions basics/type-of-function.md
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Expand Up @@ -184,7 +184,7 @@ push(a, 1, 2, 3);
利用联合类型，我们可以这么实现：

```ts
function reverse(x: number | string): number | string {
function reverse(x: number | string): number | string | void {
if (typeof x === 'number') {
return Number(x.toString().split('').reverse().join(''));
} else if (typeof x === 'string') {
Expand All @@ -200,7 +200,7 @@ function reverse(x: number | string): number | string {
```ts
function reverse(x: number): number;
function reverse(x: string): string;
function reverse(x: number | string): number | string {
function reverse(x: number | string): number | string | void {
if (typeof x === 'number') {
return Number(x.toString().split('').reverse().join(''));
} else if (typeof x === 'string') {
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