JavaScript Best Practices

Operators and comparison

Ternary operators should be put on a single line:

let status = (age >= 18) ? 'adult' : 'minor';

Not nested:

let status = (age >= 18)
  ? 'adult'
  : 'minor';

This is much harder to read.

Always use strict equality and inequality.

Do this:

name === 'Chris';
age !== 25;

Not this:

name == 'Chris';
age != 25;

Use shortcuts for boolean tests – use x and !x, not x === true and x === false.