const operations = {
  value: 10,
  multiply: function(x) {
    return this.value * x;
  },
  arrow: (x) => {
    return this.value * x;
  },
  nested: function() {
    const inner = () => this.value * 2;
    return inner();
  }
};

console.log(operations.multiply(3));
console.log(operations.arrow(3));
console.log(operations.nested());