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Var vs const

what is different

27th Mar 2017, 11:37 AM
Irakli Samniashvili
Irakli Samniashvili - avatar
2 Answers
+ 5
Mr Maruf thanks for all of this info
27th Mar 2017, 1:44 PM
Irakli Samniashvili
Irakli Samniashvili - avatar
+ 4
variable is a named location for storing a value. That way an unpredictable value can be accessed through a predetermined name i.e: var x = 1; var x = 1+1; console.log(x); // output is 2 Constants are block-scoped, much like variables only, the value of a constant cannot change through re-assignment, and it can't be redeclared i.e: // NOTE: Constants can be declared with uppercase or lowercase, but a common // convention is to use all-uppercase letters. // define MY_FAV as a constant value 7 const MY_FAV = 7; // this will throw an error MY_FAV = 20; // will print 7 console.log('my favorite number is: ' + MY_FAV); // trying to redeclare a constant throws an error const MY_FAV = 20; // the name MY_FAV is reserved for constant above, so this will also fail var MY_FAV = 20;
27th Mar 2017, 12:04 PM
John Watson
John Watson - avatar