Method chaining

Method chaining =

calling one method after another, in one continuous line of code


                let userName = "bro"

                let letter = userName.charAt(0) // b

                letter = letter.toUpperCase()

                console.log(letter) 


            result: B (Uppercase)


            let userName = "bro"

            let letter = userName.charAt(0).toUpperCase() // same, but simplified

            console.log(letter) 


        result: B (Uppercase)


        let userName = "bro"

        let letter = userName.charAt(0).toUpperCase().trim() // concatinating methods

        console.log(letter) 


    result: B (Uppercase)