Node.js
console.log(+true)
console.log(-~0)
console.log(+!0)
//=>1
ruby
puts (-~0)
# =>1
puts Array(0).length
# =>1
puts Array(0).length#=>1追記しました。
More than 5 years have passed since last update.
Register as a new user and use Qiita more conveniently
- You get articles that match your needs
- You can efficiently read back useful information
- You can use dark theme