formarray patchvalue at index code example

Example 1: formarray set value at index

((this.form.get('controls') as FormArray).at(index) as FormGroup).get('description').patchValue(item.description);

Example 2: formarray patchvalue at index

patchDynamicFormBlockValue(){
  this.alternateEmail.at(<index>).patchValue('[email protected]')
}