How to get first N number of elements from an array
To get the first n elements of an array, use
const slicedArray = array.slice(0, n);
I believe what you're looking for is:
// ...inside the render() functionvar size = 3;var items = list.slice(0, size).map(i => { return <myview item={i} key={i.id} />}return ( <div> {items} </div> )
arr.length = nThis might be surprising but length property of an array is not only used to get number of array elements but it's also writable and can be used to set array's length MDN link. This will mutate the array.
If you don't care about immutability or don't want to allocate memory i.e. for a game this will be the fastest way.
to empty an array
arr.length = 0