The addition of let and const variables is one of ES6’s most prominent features. Because these variables have block scope, only the code block in which they are defined can access them. The removal of the necessity for excessive usage of var variables, which might have unexpected implications, is one way that this feature can assist developers in writing cleaner, more maintainable code.
The arrow function syntax, which offers a more condensed manner of defining functions, is another key feature to ES6. Code is made more readable and understandable by arrow functions, which use the => operator and do away with the need for the function keyword and curly braces.