> Appending a string to a null value..? Appending a string to an undefined value, via array addition, which turns them into strings but doesn't turn null into

> Appending a string to a null value..? Appending a string to an undefined value, via array addition, which turns them into strings but doesn't turn null into 'null' or undefined into 'undefined'. It's a bit of a hack. `'a' + undefined === 'aundefined'` `[ 'a' ] + [ undefined ] === 'a'` Also the empty string '' evaluates to false. `[ undefined ] + [ undefined ] == ''` This is wat - https://archive.org/details/wat_destroyallsoftware https://archive.org/details/wat_destroyallsoftware