What's the difference between this? And why do they produce the same result?

Question

document.write("5"+6);
output // 56

document.write(5+6);
output // 11
https://code.sololearn.com/W0pJt1mR32zp/?ref=app

Answer 1

When one of the operators is string, the number will be converted to a string and concatenated (glued together).

What's that code link in your question? It seems to be totally unrelated.