Programming paradigm is a huge topic that can not be easily covered in this single post. I am here just introduce the basic ideas of it for Javascript programming, mainly Object Oriented Programming and Functional Programming.

  • Object Oriented Programming in Javascript:

Javascript is not an Object Oriented Language. However, everything in Javascript can also be regarded as an Object. Object Oriented Programming is best used for modelling different objects. The following codes show how to do Javascript programming using the Object Oriented Programming Paradigm.

function Person(name, age) {
    this.name = name;
    this.age = age;
    this.introduce = function() {
        console.log("My name is " + this.name + " and I am  " + age + " years old.");
    }
} 
    var xiaoming = new Person("xiaoming", 21);
    xiaoming.introduce();
  • Functional Programming in Javascript:

Functional Programming is another paradigm that can be used in Javascript. And most people are doing this even without realizing that they are actually using the paradigm. Functional Programming is best used for modelling different tasks. The following codes show how to loop through a group of HTML elements using Functional Programming instead of normal for loops.

  var elements = document.querySelectorAll("li");
  Array.prototype.map.call(elements, function(elem, index) {
      elem.innerText = "This is element " + index;
  });

Neither Object Oriented Programming nor Functional Programming is absolutely right in every situation. The only right way is to use the right paradigm in the right situation.:older_man: