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Update stack.md

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add javascript and typescript for stack
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S-N-O-R-L-A-X
2022-12-03 23:00:13 +08:00
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docs/chapter_stack_and_queue/stack.md
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@@ -143,13 +143,55 @@ comments: true
=== "JavaScript"
```js title="stack.js"
/* 初始化栈 */
// Javascript 没有内置的栈类，可以把 Array 当作栈来使用
const stack = [];
/* 元素入栈 */
stack.push(1);
stack.push(3);
stack.push(2);
stack.push(5);
stack.push(4);
/* 访问栈顶元素 */
peek = stack[stack.length-1];
/* 元素出栈 */
pop = stack.pop();
/* 获取栈的长度 */
size = stack.length;
/* 判断是否为空 */
is_empty = stack.length === 0;
```
=== "TypeScript"
```typescript title="stack.ts"
/* 初始化栈 */
// Typescript 没有内置的栈类，可以把 Array 当作栈来使用
const stack:number[] = [];
/* 元素入栈 */
stack.push(1);
stack.push(3);
stack.push(2);
stack.push(5);
stack.push(4);
/* 访问栈顶元素 */
peek = stack[stack.length-1];
/* 元素出栈 */
pop = stack.pop();
/* 获取栈的长度 */
size = stack.length;
/* 判断是否为空 */
is_empty = stack.length === 0;
```
=== "C"