What this snippet does
Sliding window reuses the previous sum by adding the new element and removing the old one — O(n) instead of O(n*k).
Expected output
9 18
Why practise typing this
Typing algorithms code builds muscle memory for the symbols and indentation JavaScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More JavaScript practice
- binary searchAlgorithms · intermediate
- merge sortAlgorithms · advanced
- two pointersAlgorithms · intermediate
- dynamic programmingAlgorithms · advanced
- flatten arrayAlgorithms · intermediate
- BFS traversalAlgorithms · advanced