Should I use null for the value of a number - Angular

I want an input to initially be set to empty so I set the input's ngModel to null.

<input [(ngModel)]="expenses" (keyup)="onKey($event)">


The model is used like this:

expenses: number = null;

...

if (this.expenses.toString() === '') {
this.inputHelperTextVisible = false;
}


Should I use null on a number?

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