[英]How to update all items in an Array with Airbnb JavaScript Style?
Let's say that we have an array like this:假设我们有一个这样的数组:
let list = [
{
name: '1',
count: 0,
},
{
name: '2',
count: 10,
},
{
name: '3',
count: 18,
},
];
Then how to update all items to increase count
by 1?那么如何更新所有项目以将
count
增加 1?
Here comes several solutions, while none of them is quite satisfactory:这里有几个解决方案,但没有一个是令人满意的:
/* no-restricted-syntax error, pass */
for (const item of list) {
item.count += 1;
}
/* no-param-reassign error, pass */
list.forEach((item) => {
item.count += 1;
});
/*
Object.assign is free to use without error
but it against the intention of no-param-reassign
*/
list.forEach((item) => {
Object.assign(item, { count: item.count + 1 });
});
/*
use Array.map() to replace the original array
but it costs a lot when the item is large or the array has a large length
also ugly code for such a tiny update
*/
list = list.map((item) => ({
...item,
count: item.count + 1,
}));
If you have a better solution or consider Array.map()
is good enough, please leave your opinion.如果您有更好的解决方案或认为
Array.map()
足够好,请留下您的意见。
Thank you:)谢谢:)
I generally use normal for loop to avoid Airbnb lint issue as follow:我通常使用正常的 for 循环来避免 Airbnb lint 问题,如下所示:
for (let index = 0; index < list.lenght; index++) {
const item = list[index];
if (item) {
item.count += 1;
}
}
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