Kiểm tra định dạng email bằng Javascript

let isEmailAddress = val => {
	return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(val) || /w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*/.test(val);
}
console.log(isEmailAddress('gmail.com@.com'))//false
console.log(isEmailAddress('gmail.com@gm.com'))//true

Converting Object to an Array

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.

group by property javascript use reduce

Extend Object javascript

10 mẹo sử dụng array và object trong javascript