Example 1: javascript array flat
var arr1 = [1, 2, [3, 4]];
arr1.flat();
var arr2 = [1, 2, [3, 4, [5, 6]]];
arr2.flat();
var arr3 = [1, 2, [3, 4, [5, 6]]];
arr3.flat(2);
Example 2: javascript array flatten
const arr1 = [1, 2, [3, 4]];
arr1.flat();
const arr2 = [1, 2, [3, 4, [5, 6]]];
arr2.flat();
const arr3 = [1, 2, [3, 4, [5, 6]]];
arr3.flat(2);
const arr4 = [1, 2, [3, 4, [5, 6, [7, 8, [9, 10]]]]];
arr4.flat(Infinity);
Example 3: array.flat
var arr1 = [1, 2, [3, 4]];
arr1.flat();
var arr2 = [1, 2, [3, 4, [5, 6]]];
arr2.flat();
var arr3 = [1, 2, [3, 4, [5, 6]]];
arr3.flat(2);