Loop through all form controls in formgroup in reactive form 

In this video we will discuss, how to loop through all form controls in a formgroup including nested form groups in a reactive form.
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Understanding this technique is very useful, as it can help us perform the following on all the form controls in a reactive form
1. Reset form controls
2. Enable or disable all form controls or just the nested formgroup controls
3. Set validators and clear validators
4. Mark form controls as dirty, touched, untouched, pristine etc.
5. Move validation messages and the logic to show and hide them into the component class from the view template.
Here is what we want to do : Loop through each form control in a form group including nested form groups and log the form control key and value to the console.
logKeyValuePairs(group: FormGroup): void {
// loop through each key in the FormGroup
Object.keys(group.controls).forEach((key: string) = {
// Get a reference to the control using the FormGroup.get() method
const abstractControl = group.get(key);
// If the control is an instance of FormGroup i.e a nested FormGroup
// then recursively call this same method (logKeyValuePairs) passing it
// the FormGroup so we can get to the form controls in it
if (abstractControl instanceof FormGroup) {
this.logKeyValuePairs(abstractControl);
// If the control is not a FormGroup then we know it's a FormControl
} else {
console.log('Key = ' + key + ' && Value = ' + abstractControl.value);
}
});
}

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