Angular 2: Iterate over reactive form controls

For what it's worth, there's another way to do this without having to use Object.keys(...) magic:

for (const field in this.form.controls) { // 'field' is a string

  const control = this.form.get(field); // 'control' is a FormControl  

}

Found out that Object.keys can handle this..

    Object.keys(this.form.controls).forEach(key => {
      this.form.get(key).markAsDirty();
    });

For Angular 8+, use the following (based on Michelangelo answer):

    Object.keys(this.form.controls).forEach(key => {
      this.form.controls[key].markAsDirty();
    });

The accepted answer is correct for a flat form structure, but does not completely answer the original question. A web page may require nested FormGroups and FormArrays, and we must account for this to create a robust solution.

public markControlsDirty(group: FormGroup | FormArray): void {
    Object.keys(group.controls).forEach((key: string) => {
        const abstractControl = group.controls[key];

        if (abstractControl instanceof FormGroup || abstractControl instanceof FormArray) {
            this.markControlsDirty(abstractControl);
        } else {
            abstractControl.markAsDirty();
        }
    });
}

Seems that get function is not working anymore for retrieving specific values in your form in Angular 8, so this is how I solved it based on the answer of @Liviu Ilea.

for (const field in this.myForm.controls) { // 'field' is a string
  console.log(this.myForm.controls[field].value);
}