function steamrollArray(arr) {
	let merged = [];
	merged = flattener(arr, merged);
	return merged;
}
// Flatten a nested array. You must account for varying levels of nesting.
Flatten a nested array. You must account for varying levels of nesting.
Flatten a nested array . You must account for varying levels of nesting .
function steamrollArray(arr) {
	let merged = [];
	merged = flattener(arr, merged);
	return merged;
}
function steamrollArray ( arr ) { let merged = [ ] ; merged = flattener ( arr , merged ) ; return merged ; }
Flatten a nested array.
Flatten a nested array .