Using patchValue() is as easy as typing the following:

form.patchValue({
  name: 'chris',
  surname: 'noring'
})

For example, if the previous values before calling patchValue() were as follows:

{
  name: 'christoffer',
  surname: 'n',
  age: 36
}

Then applying form.patchValue(), defined earlier, will cause the resulting form to contain the following:

{
  name: 'chris',
  surname: 'noring',
  age: 36
}

Upon closer inspection, we can see that the surname and name have been updated but the age property has been left alone.