Falsy Zero

Ade Firman Fauzi / November 2022

0 in javascript treated as false, careful if there any code had validation something like this.

const value = {a : 0}

Developer want to check undefined value if a doesn’t exist const isTrue = value.a ? true : false

If expected was true, it will treated as false. Add another validation i.e

• Object.keys(value).include(”a”)
• if typeof value.a === undefined