I am trying to figure out why we have IntRange and...

# announcements

[Florian]

I am trying to figure out why we have IntRange and IntProgression

[diesieben07]

IntProgression can have a step, you could for example iterate from 0 to 10 in steps of 2 (0, 2, 4, 6, 8, 10). IntRange is an IntProgression where the step is always 1 and as such represents a closed range.

[Florian]

so the word "Range" implies that no numbers are skipped?

[Florian]

ie no step

[diesieben07]

Yes

[diesieben07]

The range [0, 10] includes all numbers 0 through 10.

[diesieben07]

That's why you can do 5 in 0..10 but not 5 in (0..10 step 2)

[diesieben07]

Actually you can do that. Huh.

[diesieben07]

Ah, but the range simply does a check where as the progression needs to loop through all the numbers to see if one matches

[Florian]

makes sense

[Florian]

in a way, ranges are similar to arrays, right?

[diesieben07]

No, a range is really just a start and end element

[Florian]

ok

[Florian]

and what about progression

[Florian]

could you say that it is similar to an array

[Florian]

I mean I get that it generates the actual values in the iterators next function

[Florian]

but it can do a lot of the same things that an array with the same numbers could do

[diesieben07]

That is true, yes. It's an Iterable.

[karelpeeters]

Huh that's stupid, the progressions should implement contains and indexOf etc!

[Florian]

What are you referring to exactly

[karelpeeters]

Ah, but the range simply does a check where as the progression needs to loop through all the numbers to see if one matches