falsy

• falsey

false +‎ -y, to be an antonym to truthy.

• Homophone: falsie

falsy (not comparable)

1. (programming) Evaluating to false in a Boolean context.

   Antonym: truthy

   • 2012, David Flanagan, JavaScript Pocket Reference, page 40:

     In JavaScript, any expression or statement that expects a boolean value will work with a truthy or falsy value, so the fact that && does not always evaluate to true or false does not cause practical problems.

   • 2014, Basarat Syed, Beginning Node.js, →ISBN, page 33:

     However, in the second case, both '0' and the empty string ('') are falsy (in other words, they behave like false) and are therefore equal with respect to ==.

   • 2016, Kenny Ballou, Learning Elixir, →ISBN, page 92:

     If the first operand (which comes before the question mark--doIt, in this example) is truthy, the expression evaluates to the second operand (between the question mark and colon), and if it's falsy, it evaluates to the third operand (after the colon).

• flays