I have trouble understanding the usefulness of escape sequences.
To introduce some special characters inside a string of characters that can not be represented by text, we use what are commonly called escape sequences.
source: link
I want some examples to see the usefulness of them in javascript or more information about this topic.
The escape sequence is (simply) a support tool to represent those characters that sometimes we can not enter directly with the keyboard, either by physical or logical constraints. Example an emoji or line break:
let emoji = '\u{1F60D}';
let saltoLinea = '¡Hola\nmundo!';
let textoConComilla = 'Comilla simple (\'), comilla doble (").';
The language takes to recognize an escape sequence, translates what the code entails, being useful for both the programmer and the user.
I recommend the following reading: Strings - javascript.info .