const vs allow, as well as var in JavaScript

There are 3 various methods to state a variable in JavaScript: const, allow as well as var. Historically, var has actually been the only means of stating a JavaScript variable:

 var name  = ' Robin Wieruch';
 An enhancement to JavaScript– to be details: JavaScript ES6 in 2015– has actually made  const as well as  allow offered to the language: 
 allow firstName  = ' Robin';
 const lastName  = ' Wieruch';
 Clearly a lot more choices on just how to state as well as specify a variable in JavaScript does not make it simpler for programmers being brand-new to the language. Yet we can promptly make points simpler for novices: One can state that const as well as allow took control of as well as var isn’t truly made use of any longer in contemporary JavaScript. It’s primarily as a result of 2 factors: 

 const as well as allow are a lot more details concerning their use as well as objective
 var features its traits which have actually been attended to with const as well as allow

 allow vs var
 There are 2 factors I can think about why allow (as well as const) is(/ are) above var: lifting as well as scoping. Allow’s take the copying code for summarizing the age of a variety of individuals with var as the variable statement of option: 
 var personOne  =  {
   name:  ' Robin Wieruch',
   age:   30,
} ;
 var personTwo  =  {
   name:  ' Liesa Huppertz',
   age:   29,
} ;
 var family members  = [personOne, personTwo];
 feature  sumAge( individuals)  {
   var amount  =  0;
   for ( var i  =  0; i <