Take a gander at this:
function takeOrder(topping, crustType)
console.log('Order: pizza topped with '+ topping '& '+ crustType);
This threw back an error. Seeing as the declared parameters are split with a comma, and the called inputs are split with one too. Easy peasy it prints how it should.
However, previous lessons show that you can wrap a parameter in + operators when called for in
Order: pizza topped with ‘topping’& 'crustType’
compared to the correctly spaced output of what the comma separation gave.