Advent of Code - adventofcode.com

You are reading a single comment by @Tijmen and its replies. Click here to read the full conversation.

•

useless in reply to @lf
still not entirely sure what the :: does in grid[::d], apart from take every d'th y

The slice syntax is
```
grid[start:stop:stride]
```
and you can omit any, so start defaults to zero, stop to -1 (which means the end, since negative indices count backwards), and stride defaults to 1.
- grid[start] just gives you the element at index start (ie, the half-open interval [start,start+1) in maths language),
- [start:stop] gives you the sub-sequence/sub-string with default stride 1,
- [start::stride] would give you every stride'th element from start to the end, etc.

•

Tijmen in reply to @useless

This is great, just doing the challenges is already good for my programming skills but info like this and things previously posted by @Greenbank are even better. Helps me move away from hacky solutions to proper solutions.

•

Tango130 in reply to @Tijmen

+1

I find just as much enjoyment looking at others solutions to the tasks after completing it myself.

About

Avatar for Tijmen @Tijmen started