What do you mean ?

  let result = "   hello jQuery   "
  .trim()
  .replace("jQuery", "javascript")
  .toUpperCase();
  console.log(result);

map, filter, ...

  let numbers = [1, 2, 3, 4, 5];
  let result = numbers
  .filter(num => num % 2 === 0)
  .map(num => num * 2)
  .reduce((sum, num) => sum + num, 0);
  console.log(result); // 12

Simple string

  let myStr = "This is a wonderful day.";
  let reversed = myStr
  .split("")
  .reverse()
  .join("");
  console.log(reversed); // ".yad lufrednow a si sihT"
  

DOM elements

  document.querySelector('#element')
  .classList.add('active')
  .classList.remove('hidden');

Using a class

  class Chainable {
    constructor(value) {
      this.value = value;
    }

    add(num) {
      this.value += num;
      return this; // make it chainable
    }

    multiply(num) {
      this.value *= num;
      return this;
    }

    getValue() {
      return this.value;
    }
  }
  let result = new Chainable(5)
  .add(3)
  .multiply(2)
  .getValue();
  console.log(result); // 16