In JavaScript, inheritance takes place by cloning the prototype of an object.

In JavaScript $$a,x,Y,{?}_Z,$ With are valid variable names.

var lang$=$"Javascript"$//$line $1$ lang$=$"Javascript"$//$line $2$

Line $1$ has a global variable whereas line $2$ has a local variable.

var lang$=$"Javascript"$//$line $1$ lang$=$"Javascript"$//$line $2$

Line $2$ has a global variable whereas line $1$ has a local variable.

JavaScript is an object oriented programming language.

With Object.seal$(),$ you can add new properties to objects, but you cannot delete its existing properties.

var a$=$Object.seal$($Object$.$preventExtensions$(\{"$name$"$: "John", "Age":$21\}))$;

The above syntax is error free.