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Announcing TypeScript 5.6 Beta (devblogs.microsoft.com)

submitted 3 months ago by mac to c/typescript

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[–] towerful 6 points 3 months ago (1 children)

Truthy/falsey refers to how types are converted to booleans.
So an empty string is falsey. It's not false, but when compared as a Boolean it converts to false.
A 0 is falsey, any other number is truthy.

[–] [email protected] 3 points 3 months ago* (last edited 3 months ago)

One pet peeve of mine is testing libraries having toBeTruthy/toBeFalsy matchers, but not toBeTrue and toBeFalse. I get that the latter are no shorter than toBe(true), but if the former are listed in the docs, then people who don't know the terminology will use those - I've seen (past) coworkers do that.