Operator !! arrow functions

Question

What means !! in arrow function bellow ? Differences betwen ! and !! ?

 v => !!v || 'Required',

I'm using this function in vuetify rules props

nameRules: [
           v => !!v || 'Required',
       .....

Also, that is short version of ` nameRules: [ function(v) { return !!v || "Required"; } ]; ` — Đorđe Zeljić, Jul 18 '18 at 19:08

score 3 · Accepted Answer · answered Jul 18 '18 at 13:32

3

In vue.js (and javascript in general), one exclamation point negates an expression, two exclamation points ensures a boolean type

answered Jul 18 '18 at 13:32

v-gael

1 Answers1