Javascript class

class_examples.js

// the class use
class Animal {
  constructor(name) {
    this.name = name;
  }
  walk() {
    console.log(`${this.name} is walking`);
  }
}

// Kyle Simpson's OLOO style
// Using ES6's shorthand for functions
let Animal = {
  init(name) {
    this.name = name;
    return this;
  }
  walk() {
    console.log(`${this.name} is walking`);
  }
};

// fat arrow
let Animal = {
  init: (name) => {
    this.name = name;
    return this;
  },
  walk: () => {
    console.log(this.name + " is walking");
  }
};

// less es6-y
var Animal = {
  init: function(name) {
    this.name = name;
    return this;
  },
  walk: function() {
    console.log(this.name + " is walking");
  }
};

// Without using the this keyword
// Using closure
var Animal = (function(name) {
  var self = {};
  self.name = name || "";
  self.walk = function() {
    return "Walked";
  };
  return self;
});

// Strictly closures, Douglas Crockford way
function Animal(spec) {
  let {name} = spec;
  let walk = () => {
    console.log(`${name} is walking`);
  };
  return Object.freeze({
    walk
  });
}

function Animal({name} = {}) {
  let walk = () => {
    console.log(`${name} is walking`);
  };
  return Object.freeze({
    walk
  });
}

// the generic Constructor function pattern
function Animal(name) {
  this.name = name;
};

Animal.prototype.walk = function() {
  console.log(this.name + " is walking");
};