Comment by jcmoyer

The very first point under your tutorial is factually incorrect.

    var words: u8[][>..] = [];
    for i in 5 { words.push(str("word", i)); }
    
    In C++ that is a vector<string>: one heap allocation for the vector,
    one per string, a pointer and a capacity per element, and a walk over
    all of them when it goes out of scope.

The example you've provided uses strings that are eligible for small string optimization, which avoids per-string allocation. All mainstream STL implementations perform this optimization. You can read about several implementations here: https://devblogs.microsoft.com/oldnewthing/20230803-00/?p=10...