46 lines
1.7 KiB
Markdown
46 lines
1.7 KiB
Markdown
|
---
|
|||
|
|
title: Refactor Global Variables Out of Functions
|
|||
|
|
localeTitle: Глобальные переменные Refactor вне функций
|
|||
|
|
---
|
|||
|
|
## Глобальные переменные Refactor вне функций
|
|||
|
|
|
|||
|
|
* Если у вас возникли проблемы с изменением bookList, попробуйте использовать копию массива в ваших функциях.
|
|||
|
|
|
|||
|
|
* Вот еще несколько сведений о том, как \[JavaScript обрабатывает аргументы функции\] (https://codeburst.io/javascript-passing-by-value-vs- reference-explain-in-plain-english-8d00fd06a47c).
|
|||
|
|
|
|||
|
|
|
|||
|
|
##  Решение базового кода:
|
|||
|
|
|
|||
|
|
## Решение 1
|
|||
|
|
|
|||
|
|
```javascript
|
|||
|
|
function add (arr, bookName) {
|
|||
|
|
let newArr = [...arr]; // Copy the bookList array to a new array.
|
|||
|
|
newArr.push(bookName); // Add bookName parameter to the end of the new array.
|
|||
|
|
return newArr; // Return the new array.
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function remove (arr, bookName) {
|
|||
|
|
let newArr = [...arr]; // Copy the bookList array to a new array.
|
|||
|
|
if (newArr.indexOf(bookName) >= 0) { // Check whether the bookName parameter is in new array.
|
|||
|
|
/.
|
|||
|
|
newArr.splice(newArr.indexOf(bookName), 1); // Remove the given paramater from the new array.
|
|||
|
|
return newArr; // Return the new array.
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## Решение 2
|
|||
|
|
|
|||
|
|
```javascript
|
|||
|
|
function add (list,bookName) {
|
|||
|
|
return [...list, bookName];
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function remove (list,bookName) {
|
|||
|
|
if (list.indexOf(bookName) >= 0) {
|
|||
|
|
return list.filter((item) => item !== bookName);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
```
|