3 ms·

Curious: which language?

• madamelic 8y ago
  Python uses it for integer division. Typically it is meant as "divide and floor" as far as I've seen.
• jlokier 8y ago
  Perl, the defined-or operator. Like ||, but // tests definedness instead of truthiness. The equivalent in several other languages is ??, which is uglier imho, but it's just syntax. https://en.wikipedia.org/wiki/Null_coalescing_operator https://en.wikipedia.org/wiki/Null_coalescing_operator I use // and ?? often as it's conceptually clean, fast and concise. When available, it arises naturally in logic like caches, memoizations and defaults. //= is pretty useful too, and I'm surprised it's not more widely available.