Each loops over anything with a length property:
{#each {length: 3} as _, i}
{#each {length: 3} as _, i}
Or do you create an array of JSX-elements, like
let elements=[]
for (let i=0; i < 10; i++) {
elements.push(<li key={i}>I'm number {i}</li>)
}
return <ol>{elements}</ol>;