Conditional expression requires all 3 expressions at the end

This applies to a different context, but if you are using a pipe ( | ) in Angular and you get this error from your view you may need to put parentheses around your pipe like this:

<input value={{device.id ? (device.id | decimalToHex) : ''}}>

if you leave them off like this:

<input value={{device.id ? device.id | decimalToHex : ''}}>

Then you get this error

You need also to pass the result of the case in which condition will return false. In other words you need to pass correct ternary operator

Something like if/else. If true return red, else return blue.

(selectedObject === f) ? 'red' : 'blue'