2.1 Use const for all of your references; avoid using var. eslint: prefer-const, no-const-assign
Why? This ensures that you can’t reassign your references, which can lead to bugs and difficult to comprehend code.
// bad
var a = 1;
var b = 2;
// good
const a = 1;
const b = 2;
2.2 If you must reassign references, use let instead of var. eslint: no-var jscs: disallowVar
Why?
letis block-scoped rather than function-scoped likevar.
// bad
var count = 1;
if (true) {
count += 1;
}
// good, use the let.
let count = 1;
if (true) {
count += 1;
}
2.3 Note that both let and const are block-scoped.
// const and let only exist in the blocks they are defined in.
{
let a = 1;
const b = 1;
}
console.log(a); // ReferenceError
console.log(b); // ReferenceError