Template Literals – Probably the most comfortable way to concatenate strings and variables that hold values.
Default paramters in a function are preset parameters, which are used when no arguments are provided in the function call that overwrites them. ES6 provides us now with a very simple and intuitive way to declare them.
Before ES6 (ECMASCRIPT 2015) came out the only way to declare a new variable was via the keyword “var”. ES6 introduced two new ways for developers to declare them: “let” & “const”.