es6 Fat Arrow function in Server Side

es6 Fat Arrow function in Server Side

var a = [
  "Hydrogen",
  "Helium",
  "Lithium",
  "Beryl­lium"
];

var a2 = function(s){ return s.length };

var a3 = ((s) => s.length);

console.log(a2(a));
console.log(a3(a));


// Simple => 
var str = "Please find where there is a find";
var searchStr = "find";
var pos = function(totalStr,stringToSearch){ return str.indexOf(stringToSearch) };

console.log(pos(str,searchStr));

var es6pos = (totalStr,stringToSearch) => str.indexOf(stringToSearch);

console.log(es6pos(str,searchStr));

// another example  =>

var str = "Please find where there is a find";
var searchStr = "find";

var pos = function(totalStr,stringToSearch){ return str.indexOf(stringToSearch) };

var logIt = function(anything){console.log( anything)};

logIt(pos(str,searchStr));

var intermediateResult = ((totalStr,stringToSearch) => str.indexOf(stringToSearch)) ;

var es6Logit = intermediateResult => console.log(intermediateResult);

es6Logit(intermediateResult(str,searchStr));


// foreach i.e in statement body

//ecma5
var arr = ["a", "b", "c"];

arr.forEach(function(entry) {
    console.log(entry);
});

//or the old way
var index;

for (index = 0; index < arr.length; ++index) {
    console.log(arr[index]);
}

//now in es6

// Statement bodies
arr.forEach(elem => console.log(elem));

// Lexical this

//ecma5

function Person() {
  var self = this; 
                   
  self.age = 14;

  self.grow = function () {
    // The callback refers to the `self` variable of which
    // the value is the expected object.
    return self.age++;
  };
}

var p = new Person();

console.log(p.grow());
console.log(p.grow());

//ecma6

function Person(){
  this.age = 14;

  this.grow = () => {
    return this.age++; // |this| properly refers to the person object
  };
}

var p = new Person();

console.log("es6 --"+ p.grow());
console.log("es6 --"+ p.grow());