Alert() with dynamic content javascript

Question

What is wrong with alert({s[prop]}) but fine with this placeholder={s[prop]}

It says I am missing a ',' after 's' and ':' after ']'

Answer 1

alert(s['use your key'])

Please use in this way. Avoid using {} in alert(), If you use you will see [object Object] instead of actual dynamic content.

Answer 2

try with

alert(s[prop])

In JSX to print any JS variable it must be wrap inside curly braces, but not required when using in JS, alert is the JavaScript function.