So one thing I try to be very good about is never doing more than one thing in a line, which means always using named conditions and named returns. So in other words, if statements and return statements should always contain a single variable that describes the condition or what's being returned, and should not contain function calls, boolean logic, etc. This typically involves giving things descriptive names and then not using them more than once, but it makes the code more readable.

So e.g. you have lines like:

  const isCar = (wheels === 4) && (steeringWheels === 1) && (canDrive === true);
  if (isCar) { ... }

and not lines like:

  if ((wheels === 4) && (steeringWheels === 1) && canDrive === true) { ... }

And similarly:

  const isCar = (wheels === 4) && (steeringWheels === 1) && (canDrive === true);
  return isCar;

Rather than:

  return (wheels === 4) && (steeringWheels === 1) && (canDrive === true);

I'd actually like linters for JS and Python to enforce named conditionals and named returns, but afaik no one has done this yet.