What is method chaining in JavaScript?

Method chaining is a technique in JavaScript where multiple methods are called on the same object in a single statement. This is often achieved by having each method return the object itself, allowing for a chain of method calls. It is commonly used to create a fluent interface and to write more concise and readable code. 

class Calculator {
  constructor() {
    this.value = 0;
  }
  add(num) {
    this.value += num;
    return this;
  }
  multiply(num) {
    this.value *= num;
    return this;
  }
  getResult() {
    return this.value;
  }
}

const result = new Calculator()
  .add(5)
  .multiply(2)
  .getResult();
console.log(result); // 10