ch03_test1.js

var name ;
console.log('name : ' + name);

var age =20;
console.log('age : '   + age);

name='소녀시대';
console.log('name : ' + name);

Command: node "C:/Program Files (x86)/Brackets/www/macaronics/ch03_test1.js"

Working directory: C:/Program Files (x86)/Brackets/www/macaronics/

name : undefined

age : 20

name : 소녀시대

Program exited with code 0