angular formarray remove all

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1const arr = new FormArray([
2   new FormControl(),
3   new FormControl()
4]);
5console.log(arr.length);  // 2
6
7arr.clear();
8console.log(arr.length);  // 0
9

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

1formArray.clear();

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