Tránh viết biến có phạm vi global

tipjs,scope,global

Không nên

    var map = document.querySelector("#my-map");
    map.style.height = "600px";
Nên
!function(){
    var map = document.querySelector("#my-map");
    map.style.height = "600px";
}()

Có thể bạn đã miss một số snippets code

Random Number javascript

Random Number javascript

kiểm tra email trong javascript

kiểm tra email trong javascript

Rest Operator for Objects

Now we can use rest on the properties of an Object. It allows us to explicitly extract certain named variables, and assign any uncalled variables into a catchall Object.

flatMap()

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

group by property javascript use reduce

group by property javascript use reduce