map question

[forkit via Digitalmars-d-learn]

trying to make sense of the below:

// ---
module test;

import std;

void main()
{
    auto rnd = Random(unpredictableSeed);

    int howManyTimes = 5;

    // ok - using 'e =>' makes sense
    writeln(howManyTimes.iota.map!(e => rnd.dice(0.6, 
1.4)).format!"%(%s,%)");

    // ok - though using 'howManyTimes =>' doesn't make much 
sense??
    writeln(howManyTimes.iota.map!(howManyTimes => rnd.dice(0.6, 
1.4)).format!"%(%s,%)");

    // NOT ok - using '5 =>' - but isn't this effectively the 
same as above line?
    //writeln(howManyTimes.iota.map!(5 => rnd.dice(0.6, 
1.4)).format!"%(%s,%)");
}

// ---