Merge Array

How to combine two sorted arrays into one? We can do this easily with the spread operator.

a1 = [1, 2, 5, 6, 9];
a2 = [3, 4, 7, 8, 10];

res = [...a1, ...a2]; // [1, 2, 5, 6, 9, 3, 4, 7, 8, 10]

But if we want to combine and sort? Again, nothing complicated!

res = [...a1, ...a2].sort((a, b) => +a > +b); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

10 mẹo sử dụng array và object trong javascript

Sử dụng formdata constructor để convert form, FormData, array.from(). Kết hợp window.encodeURIComponent() để encode từng value trong form.

Use flatMap() creates a new array with sub-array elements flattened by specified depth.