A rest parameter collects the remaining arguments passed to a function into a new array. Write it with `...` before the parameter name, and place it last in the parameter list. section 3.4.1 section 3.5
Collecting the remaining numbers
In `multiMax(3, 1, 2, 3)`, `first` receives `3` and `remainingNumbers` receives `[1, 2, 3]`. The function sorts that array in descending order, then multiplies the first value by the largest. Sorting works here, though the example notes it is not the most efficient way to find the largest number. section 3.4.1
Listing 3.7. Using rest parameters
function multiMax(first, ...remainingNumbers){ #A
var sorted = remainingNumbers.sort(function(a, b){
return b – a; #B
});
return first * sorted[0];
}
assert(multiMax(3, 1, 2, 3) == 9, #C
"3*3=9 (First arg, by largest.)");
See the complete `multiMax` function and its call. section 3.4.1
Only the final function parameter can be a rest parameter; placing another parameter after it causes a `SyntaxError`. Rest parameters provide a way to access excess arguments without using the legacy `arguments` object. section 3.4.1 section 4.1.1
