fill javascript

1const a = new Array(100).fill("test");
2
3console.log(a);

1let filledArray = new Array(10).fill({'hello':'goodbye'});

1new Array(5).fill('element')
2// ["element", "element", "element", "element", "element"]

1fill(val); 
2fill(val, start);	//fills array with value of val at index start
3fill(val, start, end); //fills array with value of val at index start to index end
4