how to create a ellipse in java javascript code example

Example: ellipses in js

//Example: 
const numbers1 = [1, 2, 3, 4, 5];
const numbers2 = [ ...numbers1, 1, 2, 6,7,8]; 
// this will be [1, 2, 3, 4, 5, 1, 2, 6, 7, 8]