S.O.L.I.D Principles for JS with examples, see more at https://medium.com/p/db95b44e82e

SOLID_LSPExample.js

class Retangle {
  constructor({ width, length }) {
    this.setWidth(width);
    this.setLength(length);
  }

  setWidth(width) {
    this.width = width;
  }

  setLength(length) {
    this.length = length;
  }

  getWidth() {
    return this.width;
  }

  getLength() {
    return this.length;
  }

  getArea() {
    return this.width * this.length;
  }
}

class Square {
  constructor(side) {
    this.setSide(side);
  }

  setSide(side) {
    this.side = side;
  }

  getSide() {
    return this.side;
  }

  getArea() {
    return this.side * this.side;
  }
}

const run = () => {
  const SquareInstance = new Square(7);

  console.log(SquareInstance.getArea()); // will output 49
};

run();