Edit - Stack Overflow

You are not logged in. Your edit will be placed in a queue until it is peer reviewed.

We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.

You can start with sum (x:xs) = g x xs immediately to avoid 0 + .... (Which only works because (+) 0 is essentially id for numeric types.)

Mateen Ulhaq
– Mateen Ulhaq

2018-11-03 08:49:05 +00:00
Commented Nov 3, 2018 at 8:49
1

but then I have to handle the [] case separately. With the explicit 0. It's unavoidable.

Will Ness
– Will Ness

2018-11-03 08:49:30 +00:00
Commented Nov 3, 2018 at 8:49
What do you mean by the last one (of the first code block) being in tail recursive form?

David Young
– David Young

2018-11-03 16:58:25 +00:00
Commented Nov 3, 2018 at 16:58
@DavidYoung in g x (y:xs) = g (x+y) xs, call to g is a tail call.

Will Ness
– Will Ness

2018-11-03 18:36:42 +00:00
Commented Nov 3, 2018 at 18:36

Add a comment |

Correct minor typos or mistakes
Clarify meaning without changing it
Add related resources or links
Always respect the author’s intent
Don’t use edits to reply to the author

create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>

formatting help »
answering help »

Collectives™ on Stack Overflow