const letters = [{letter: 'a'},{letter: 'b'},{letter: 'c'}]

​

const index = letters.findIndex((element, index) => {

  if (element.letter === 'b') {

    return true

  }

})

​

//index is `1`

// Get index of object with specific value in array

const needle = 3; // needle

const haystack = [{ id: 1 }, { id: 2 }, { id: 3 }]; // haystack

const index = haystack.findIndex(item => item.id === needle);

// Get index of object with specific value in array

const needle = 3;

const haystack = [{ id: 1 }, { id: 2 }, { id: 3 }];

const index = haystack.findIndex(item => item.id === needle);

var elementPos = array.map(function(x) {return x.id; }).indexOf(idYourAreLookingFor);

var objectFound = array[elementPos];

 appBar: AppBar(

          title: const Text('AppBar Title'),

          // Changing the text color here

          titleTextStyle: TextStyle(

            color: Colors.white, // Set your desired color

            fontSize: 20, // Optional: set font size

          ),