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Exercise 4

What happens when you run the following code? Why?

const NAME = 'Victor';
console.log('Good Morning, ' + NAME);
console.log('Good Afternoon, ' + NAME);
console.log('Good Evening, ' + NAME);

NAME = 'Joe';
console.log('Good Morning, ' + NAME);
console.log('Good Afternoon, ' + NAME);
console.log('Good Evening, ' + NAME);

Solution

The program first greets Victor 3 times. It then encounters an error on line 6, which prevents it from greeting Joe. The problem is that constants are, well, constant. You can't reassign a constant after defining it. You must use regular variables instead:

let name = 'Victor';
console.log('Good Morning, ' + name);   // => Good Morning, Victor
console.log('Good Afternoon, ' + name); // => Good Afternoon, Victor
console.log('Good Evening, ' + name);   // => Good Evening, Victor

name = 'Joe';                           // no error!
console.log('Good Morning, ' + name);   // => Good Morning, Joe
console.log('Good Afternoon, ' + name); // => Good Afternoon, Joe
console.log('Good Evening, ' + name);   // => Good Evening, Joe

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