help-js

I have an array of objects.  Each object has many fields, but I want to update the `linePosition` field in all of the objects.  I simply want to decrement it by one.  Would `map` be my best bet here?

If it matters, this array is a React state array.

```js
for (const object of array) {
  object.property_to_update = 'new value';
}
```

Oh, in this case use functional update with `.map()` to avoid state mutation

```js
setState(prev => prev.map((obj) => ({
  ...obj,
  property_to_update: 'new value'
})));
```