Answers for "var let and const"

difference in var let and const

var: 
	* hoisted(global scope)
    * function scope
let:
    * block scope
    * reassignable
    * not redeclarable
const: 
    * block scope
    * not reassignable
    * not redeclarable

var or const in javascript

// var declares a variable, meaning its value will vary. 
// const declares a constant, meaning its value will remain 
// consistant and not change. 
// If your variable changes throughout the program or website, 
// declare it using a var statement. 
// Otherwise, if its value does not change, declare it using 
// a const statement. 

const myConst='A const does not change.';

var myVar='A var does change.';

var myVar=2;

const let var

var greeter;
    console.log(greeter); // greeter is undefined
    greeter = "say hello"

const let var

var makes real ice cubes that rattle around in New York
let makes real ice cubes in Manhatten 
const is like let but the ice cubes never change because they are plastic