re: Sorting Algorithms with Javascript (Part 1) VIEW POST


Hello there! First let me thank you for the article, it helped me a lot. As I was developing an insertion sort I came across your code and used it, although you have a litle mistake I ended up finding.

instead of:
if (list[i] > list[j-1] && list[i] < list[j])

you should have (= is missing on second validation):
if (list[i] > list[j-1] && list[i] =< list[j])

Otherwise, it wont sort. Once again, thank you!


Hey there! I'm glad you found it helpful. Thanks for that 😄.

The code seems to work just fine with the test list provided though. Would you mind explaining why the = is necessary? Or maybe share the list you tested the code with so I can also try it.

Ps: The = should be on the other side of the < in your example though, like so: if (list[i] > list[j-1] && list[i] <= list[j]) 🙂


Hey Kinyanjui, thanks again for the post! Super helpful!

Just hoping on to this, I noticed an issue with the same line of code where if a list has two elements with the same value it won't sort it properly. i.e. [4, 2, 3, 2, 1, 5] gives [ 1, 2, 3, 4, 2, 5 ] as a result.

Adding an = sign to the first argument makes all the difference! if (list[i] >= list[j-1] && list[i] < list[j]). It now returns [ 1, 2, 2, 3, 4, 5 ] :)

Thanks Lynn. I've edited the code to include your fix.

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