How to Access and Process Nested Objects and Arrays in Javascript with example

How can we access and process nested objects and arrays in javascript
nested data structures
arrays inside objects
objects inside arrays

const grade = {
gradeno: 5,
students: [{
rollno: 1,
name: 'Jacob',
passed: true
}, {
rollno: 2,
name: 'Mary',
passed: false
,
}]
};