I would like to ask how can I limit my .map loop for example to a 5 items only because currently when I access an api it returns 20 items. but I want to display only 5. Mostly that I found is just looping all throughout the array of objects and not limiting it to a number of items.
Note: I have no control on the API because I'm just using the moviedb api
Here's my code:
var film = this.props.data.map((item) => {
return <FilmItem key={item.id} film={item} />
});
return film;
You could use Array#slice and take only the elements you need.
var film = this.props.data.slice(0, 5).map((item) => {
return <FilmItem key={item.id} film={item} />
});
return film;
If you do not need the original array anymore, you could mutate the array by setting the length to 5 and iterate them.
You could use filter() as well
var film = this.props.data.filter((item, idx) => idx < 5).map(item => {
return <FilmItem key={item.id} film={item} />
});
return film;
You can also limit it by passing a second argument to a map() callback, which would be an index of an item in the loop.
const film = this.props.data?.map(
(item, index) =>
index < 5 && ( // <= only 5 items
<FilmItem
key={item.id}
film={item}
/>
)
);
return film;
However, you probably should stick to Nina's answer unless you really need some elegancy in your code. Since I'm guessing my answer would be slower performance-wise.
References: