var Keyword
Syntax
var varname1 [= value1] [, varname2 [= value2] ... [, varnameN [= valueN]]];
varnameN
Variable name. It can be any legal identifier.
valueN Optional
Initial value of the variable. It can be any legal expression. Default value is
undefined.
Alternatively, the Destructuring Assignment syntax can also be used to declare variables.
var { bar } = foo; // where foo = { bar:10, baz:12 };
/* This creates a variable with the name 'bar', which has a value of 10 */