AntiHero

const polygonArea = (ps) => {
  const v = ps.reduce(
    (acc, p, i) => (acc += p.x * ps.at(i - 1).y - ps.at(i - 1).x * p.y),
    0
  );

  return Math.abs(v) / 2;
};

// or

AntiHero

Data types
Variables
Type conversion
Operators (unary, binary, string concatenation ('+' operator), numeric conversion ('+' operator))
Logical operators
Conditional operators (if, ?)
Loops ('while', 'for')
Switch
Variable scoping, hoisting
Let, var, const