Variables in ES6

ES6 include a new kinds of variables let and const.

Let

let nom = 'lucas';
return nom; // lucas
nom = 'thomas';
return nom; // thomas

function driverlicence(passed) {
  if(passed) {
    let name = 'lucas'; // let and const create a block scop
    const age = 1995;
    return '${name} can now drive, he was born in ${age}'; // lucas can now drive, he was born in 1995
  }
  return '${name} can now drive, he\'s was born in ${age}'; // Error !!!!
}

let i = 23;

for(let i = 0; i < 5; i++) {
  return i; // 0,1,2,3,4
}

return i; // 23

1. With es6 you can declares variables with two new terms let, const.
2. One specific thing about let and const is the creation of block-scoped as you know in javascript a scoped is created only with functions but when you use let and const a scope is created in an if / else statements, a for loop etc.. as you can see in the example above.

Const

const age = 22;
return age; // 22
age = 25;
return age; // Error !!!

1. A const variable works exactly the same than let except that you can't change the value of a const variable.

Current errors

This is a list of the main errors that you can meet when you use class with ES6 syntax:

Note: I'm not a wizard there is maybe some issue that you notice above so fell free to open an issue in the github repo if you find a new error not mentioned above.