Agfdhyk

I have an object:

export class ReccurrenceModel {

    fromDate: Date;

    toDate: Date;

    weeklyReccurrence: number;

    state: State;

    isMonday: boolean;

    isTuesday: boolean;

    isWednesday: boolean;

    isThursday: boolean;

    isFriday: boolean;

    fromDateToReturn: Date;

    toDateToReturn: Date;

}

I use it like this

  if (this.reccurrenceSelected === true) {

      this.reccurrence.isMonday = this.mondaySelected;

      this.reccurrence.isTuesday = this.tuesdaySelected;

      this.reccurrence.isWednesday = this.wednesdaySelected;

      this.reccurrence.isThursday = this.thursdaySelected;

      this.reccurrence.isFriday = this.fridaySelected;

}

I want to set a default value for them - false because if I do not set them in in UI, they will be undefined and I don't want that.

How to set de default value of a boolean in typescript?

undefined, as well as false, are both falsy values that you can test the same way.

But default values are set with

export class ReccurrenceModel {

    fromDate: Date;

    toDate: Date;

    weeklyReccurrence: number;

    state: State;

    isMonday = false;

    isTuesday = false;

    ...

    fromDateToReturn: Date;

    toDateToReturn: Date;

}

Doesn't make any big change in UI level you can use either. Both are falsy values for UI.

You can set anyone.

variableName = false 

or

variableName: boolean;

variableName you can use either UI consider it as false by default untill you assign its value to true.

I would suggest to use getters and setters in class

export class ReccurrenceModel {

    fromDate: Date;

    toDate: Date;

    weeklyReccurrence: number;

    state: State;

    isMonday: boolean;

    isTuesday: boolean;

    isWednesday: boolean;

    isThursday: boolean;

    isFriday: boolean;

    fromDateToReturn: Date;

    toDateToReturn: Date;

        ...



        get fromDate() {

            return this.fromDate|| "";

        }

        get isMonday() {

            return this.isMonday|| false;

        }

    }

I would add a default constructor and do something like this :

export class ReccurrenceModel {

    fromDate: Date;

    toDate: Date;

    weeklyReccurrence: number;

    state: State;

    isMonday: boolean;

    isTuesday: boolean;

    isWednesday: boolean;

    isThursday: boolean;

    isFriday: boolean;

    fromDateToReturn: Date;

    toDateToReturn: Date;



    constructor(){

      this.isMonday = false;

      this.isTuesday = false;

      this.isWednesday = false;

      this.isThursday = false;

      this.isFriday = false;

    }

}

later i would do something like this : ,

this.reccurrence = new ReccurrenceModel();

The above line would initialize the required fields.
you can confirm this by doing a console.log(this.reccurrence) after calling the constructor