Understanding how to show or hide a text field based on a boolean in Sanity.io.

hi all !i'm new to sanity. this is so amazing to learn.

here is my question,

i need a text field to show and hide based on a boolean.
i changed a bit of code from
"Conditional validation of string" and i endup with the below code and it worked.but i need to understand how this work. can someone please explain this to me.
if you have a better solution for this i also like to hear them too. thnx

{
name: "flag",
title: "Show or Hide",
type: "boolean",
},
{
name: "entry",
type: "string",
title: "Entry",
hidden: ({document}) => !document.flag
},

Welcome !
The code you’ve constructed makes use of a callback function that’s returning

true

or

false

to your

entry

field’s

hidden

property.

({document}) => !document.flag

is destructuring

document

from the argument being passed to the callback function, which gives you access to the value of the

flag

field. If

flag

is true, then

!document.flag

is false, which means

entry

will not be hidden. If

flag

is false (or indeterminate and therefore undefined),

!document.flag

is true, which means

entry

will be hidden.
As for your request for better solutions, we recommend optional chaining in case

document

is undefined (so

!document.flag

becomes

!document?.flag

). You may also want to confirm that the behaviour you’re getting when

flag

is indeterminate (e.g., unset or “in the middle”) is what you want. Undefined is falsy so

!flag

will resolve to

true

when

flag === undefined

.

Really nice job adapting some code for your own use. Looking forward to seeing what you continue to build. 😀

Thank you for your explanation.

i should telll you english not my main language. therefore sometimes its hard to understand something for first time.

I understand. If there is anything that is still unclear, please let us know.

as i understand from your answer. is this the right way that i should define the code ?

the output was this

That looks good to me. 👍

thanks for your time and help.really appreciate it
😊 👍

Our pleasure! 😁

quick question.how do i find latest apiVersion for client.js ?