Set default value of boolean typescript

up vote
0
down vote

favorite

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?

asked 2 days ago

celamoet

1361211

try isMonday:boolean = false;
– Fateme Fazli
2 days ago

may be variabelName = false, is it?
– Pardeep Jain
2 days ago

1

@FatemeFazli this gives a lint error for redundancy (just to inform)
– trichetriche
2 days ago

1

@FatemeFazli also this is not recommended way
– Pardeep Jain
2 days ago

1

@trichetriche , PardeepJain thank you.
– Fateme Fazli
2 days ago

add a comment |

up vote
0
down vote

favorite

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?

asked 2 days ago

celamoet

1361211

try isMonday:boolean = false;
– Fateme Fazli
2 days ago

may be variabelName = false, is it?
– Pardeep Jain
2 days ago

1

@FatemeFazli this gives a lint error for redundancy (just to inform)
– trichetriche
2 days ago

1

@FatemeFazli also this is not recommended way
– Pardeep Jain
2 days ago

1

@trichetriche , PardeepJain thank you.
– Fateme Fazli
2 days ago

add a comment |

up vote
0
down vote

favorite

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?

asked 2 days ago

celamoet

1361211

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?

angular typescript boolean

asked 2 days ago

celamoet

1361211

asked 2 days ago

celamoet

1361211

asked 2 days ago

celamoet

1361211

asked 2 days ago

celamoet

1361211

asked 2 days ago

celamoet

1361211

try isMonday:boolean = false;
– Fateme Fazli
2 days ago

may be variabelName = false, is it?
– Pardeep Jain
2 days ago

1

@FatemeFazli this gives a lint error for redundancy (just to inform)
– trichetriche
2 days ago

1

@FatemeFazli also this is not recommended way
– Pardeep Jain
2 days ago

1

@trichetriche , PardeepJain thank you.
– Fateme Fazli
2 days ago

add a comment |

try isMonday:boolean = false;
– Fateme Fazli
2 days ago

may be variabelName = false, is it?
– Pardeep Jain
2 days ago

1

@FatemeFazli this gives a lint error for redundancy (just to inform)
– trichetriche
2 days ago

1

@FatemeFazli also this is not recommended way
– Pardeep Jain
2 days ago

1

@trichetriche , PardeepJain thank you.
– Fateme Fazli
2 days ago

try isMonday:boolean = false;
– Fateme Fazli
2 days ago

may be variabelName = false, is it?
– Pardeep Jain
2 days ago

@FatemeFazli this gives a lint error for redundancy (just to inform)
– trichetriche
2 days ago

@FatemeFazli also this is not recommended way
– Pardeep Jain
2 days ago

@trichetriche , PardeepJain thank you.
– Fateme Fazli
2 days ago

add a comment |

4 Answers
4

active

oldest

votes

up vote
3
down vote

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;

}

answered 2 days ago

trichetriche

23.6k41949

add a comment |

up vote
1
down vote

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;

        }

    }

edited 2 days ago

answered 2 days ago

Rohit.007

1,4082418

add a comment |

up vote
1
down vote

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

variableName: boolean;

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

edited yesterday

answered 2 days ago

Pardeep Jain

35.6k1696133

Downvoter, May I have an explanation?
– Pardeep Jain
2 days ago

stackoverflow.com/help/privileges/vote-down check here, clearly mentioned Use your downvotes whenever you encounter an egregiously sloppy, no-effort-expended post, or an answer that is clearly and perhaps dangerously incorrect. so my answer was neither incorrect nor unclear.
– Pardeep Jain
yesterday

1

Sounds great you know something new now, But dude offcourse its not about single upvote for me its about correct or incorrect. anyways thanks for removing downvote :)
– Pardeep Jain
yesterday

add a comment |

up vote
0
down vote

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

edited yesterday

answered 2 days ago

CruelEngine

8641917

add a comment |

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53373572%2fset-default-value-of-boolean-typescript%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

4 Answers
4

active

oldest

votes

4 Answers
4

active

oldest

votes

up vote
3
down vote

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;

}

answered 2 days ago

trichetriche

23.6k41949

add a comment |

up vote
3
down vote

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;

}

answered 2 days ago

trichetriche

23.6k41949

add a comment |

up vote
3
down vote

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;

}

answered 2 days ago

trichetriche

23.6k41949

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;

}

answered 2 days ago

trichetriche

23.6k41949

answered 2 days ago

trichetriche

23.6k41949

answered 2 days ago

trichetriche

23.6k41949

answered 2 days ago

trichetriche

23.6k41949

add a comment |

up vote
1
down vote

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;

        }

    }

edited 2 days ago

answered 2 days ago

Rohit.007

1,4082418

add a comment |

up vote
1
down vote

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;

        }

    }

edited 2 days ago

answered 2 days ago

Rohit.007

1,4082418

add a comment |

up vote
1
down vote

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;

        }

    }

edited 2 days ago

answered 2 days ago

Rohit.007

1,4082418

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;

        }

    }

edited 2 days ago

answered 2 days ago

Rohit.007

1,4082418

edited 2 days ago

answered 2 days ago

Rohit.007

1,4082418

answered 2 days ago

Rohit.007

1,4082418

answered 2 days ago

Rohit.007

1,4082418

add a comment |

up vote
1
down vote

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

variableName: boolean;

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

edited yesterday

answered 2 days ago

Pardeep Jain

35.6k1696133

Downvoter, May I have an explanation?
– Pardeep Jain
2 days ago

stackoverflow.com/help/privileges/vote-down check here, clearly mentioned Use your downvotes whenever you encounter an egregiously sloppy, no-effort-expended post, or an answer that is clearly and perhaps dangerously incorrect. so my answer was neither incorrect nor unclear.
– Pardeep Jain
yesterday

1

Sounds great you know something new now, But dude offcourse its not about single upvote for me its about correct or incorrect. anyways thanks for removing downvote :)
– Pardeep Jain
yesterday

add a comment |

up vote
1
down vote

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

variableName: boolean;

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

edited yesterday

answered 2 days ago

Pardeep Jain

35.6k1696133

Downvoter, May I have an explanation?
– Pardeep Jain
2 days ago

stackoverflow.com/help/privileges/vote-down check here, clearly mentioned Use your downvotes whenever you encounter an egregiously sloppy, no-effort-expended post, or an answer that is clearly and perhaps dangerously incorrect. so my answer was neither incorrect nor unclear.
– Pardeep Jain
yesterday

1

Sounds great you know something new now, But dude offcourse its not about single upvote for me its about correct or incorrect. anyways thanks for removing downvote :)
– Pardeep Jain
yesterday

add a comment |

up vote
1
down vote

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

variableName: boolean;

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

edited yesterday

answered 2 days ago

Pardeep Jain

35.6k1696133

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

variableName: boolean;

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

edited yesterday

answered 2 days ago

Pardeep Jain

35.6k1696133

edited yesterday

answered 2 days ago

Pardeep Jain

35.6k1696133

answered 2 days ago

Pardeep Jain

35.6k1696133

answered 2 days ago

Pardeep Jain

35.6k1696133

Downvoter, May I have an explanation?
– Pardeep Jain
2 days ago

stackoverflow.com/help/privileges/vote-down check here, clearly mentioned Use your downvotes whenever you encounter an egregiously sloppy, no-effort-expended post, or an answer that is clearly and perhaps dangerously incorrect. so my answer was neither incorrect nor unclear.
– Pardeep Jain
yesterday

1

Sounds great you know something new now, But dude offcourse its not about single upvote for me its about correct or incorrect. anyways thanks for removing downvote :)
– Pardeep Jain
yesterday

add a comment |

Downvoter, May I have an explanation?
– Pardeep Jain
2 days ago

stackoverflow.com/help/privileges/vote-down check here, clearly mentioned Use your downvotes whenever you encounter an egregiously sloppy, no-effort-expended post, or an answer that is clearly and perhaps dangerously incorrect. so my answer was neither incorrect nor unclear.
– Pardeep Jain
yesterday

1

Sounds great you know something new now, But dude offcourse its not about single upvote for me its about correct or incorrect. anyways thanks for removing downvote :)
– Pardeep Jain
yesterday

Downvoter, May I have an explanation?
– Pardeep Jain
2 days ago

stackoverflow.com/help/privileges/vote-down check here, clearly mentioned

Use your downvotes whenever you encounter an egregiously sloppy, no-effort-expended post, or an answer that is clearly and perhaps dangerously incorrect.

so my answer was neither incorrect nor unclear.
– Pardeep Jain
yesterday

stackoverflow.com/help/privileges/vote-down check here, clearly mentioned

Use your downvotes whenever you encounter an egregiously sloppy, no-effort-expended post, or an answer that is clearly and perhaps dangerously incorrect.

so my answer was neither incorrect nor unclear.
– Pardeep Jain
yesterday

Sounds great you know something new now, But dude offcourse its not about single upvote for me its about correct or incorrect. anyways thanks for removing downvote :)
– Pardeep Jain
yesterday

add a comment |

up vote
0
down vote

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

edited yesterday

answered 2 days ago

CruelEngine

8641917

add a comment |

up vote
0
down vote

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

edited yesterday

answered 2 days ago

CruelEngine

8641917

add a comment |

up vote
0
down vote

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

edited yesterday

answered 2 days ago

CruelEngine

8641917

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

edited yesterday

answered 2 days ago

CruelEngine

8641917

edited yesterday

answered 2 days ago

CruelEngine

8641917

answered 2 days ago

CruelEngine

8641917

answered 2 days ago

CruelEngine

8641917

add a comment |

draft saved

draft discarded

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

Search This Blog

Ufyukyu