Let's say that we have an array like this:
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?
Here comes several solutions, while none of them is quite satisfactory:
/* 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.
Thank you :)
I generally use normal for loop to avoid Airbnb lint issue as follow:
for (let index = 0; index < list.lenght; index++) {
const item = list[index];
if (item) {
item.count += 1;
}
}