https://stackoverflow.com/questions/49395203/iterate-angular-2-formarray
formArray {
controls:[....formControl1,fomrControl2...]
}
for (let control of formArray.controls) {
if (control instanceof FormControl) {
// is a FormControl
}
if (control instanceof FormGroup) {
// is a FormGroup
}
if (control instanceof FormArray) {
// is a FormArray
}
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