How to check whether a boolean value is false in every object of an array in?

I have an array which consists of multiple objects:

quesListArray = [

                   {Position: 1, Mandatory: false}, 

                   {Position: 2, Mandatory: true}, 

                   {Position: 3, Mandatory: false}, 

                   ...

                   ...

                ]

How can I get to know whether 'Mandatory' field in every object is false or not. If all are false then I need to show a message.

Any help will be appreciated. Thank you.

edited Dec 31 '18 at 5:42

Ingo Bürk

10.8k53575

asked Dec 30 '18 at 5:01

Mr. A

1

how is this question related to Angular?

– JulianG
Dec 30 '18 at 19:52

add a comment |

I have an array which consists of multiple objects:

quesListArray = [

                   {Position: 1, Mandatory: false}, 

                   {Position: 2, Mandatory: true}, 

                   {Position: 3, Mandatory: false}, 

                   ...

                   ...

                ]

How can I get to know whether 'Mandatory' field in every object is false or not. If all are false then I need to show a message.

Any help will be appreciated. Thank you.

edited Dec 31 '18 at 5:42

Ingo Bürk

10.8k53575

asked Dec 30 '18 at 5:01

Mr. A

1

how is this question related to Angular?

– JulianG
Dec 30 '18 at 19:52

add a comment |

I have an array which consists of multiple objects:

quesListArray = [

                   {Position: 1, Mandatory: false}, 

                   {Position: 2, Mandatory: true}, 

                   {Position: 3, Mandatory: false}, 

                   ...

                   ...

                ]

How can I get to know whether 'Mandatory' field in every object is false or not. If all are false then I need to show a message.

Any help will be appreciated. Thank you.

edited Dec 31 '18 at 5:42

Ingo Bürk

10.8k53575

asked Dec 30 '18 at 5:01

Mr. A

I have an array which consists of multiple objects:

quesListArray = [

                   {Position: 1, Mandatory: false}, 

                   {Position: 2, Mandatory: true}, 

                   {Position: 3, Mandatory: false}, 

                   ...

                   ...

                ]

How can I get to know whether 'Mandatory' field in every object is false or not. If all are false then I need to show a message.

Any help will be appreciated. Thank you.

typescript

edited Dec 31 '18 at 5:42

Ingo Bürk

10.8k53575

asked Dec 30 '18 at 5:01

Mr. A

edited Dec 31 '18 at 5:42

Ingo Bürk

10.8k53575

asked Dec 30 '18 at 5:01

Mr. A

edited Dec 31 '18 at 5:42

Ingo Bürk

10.8k53575

edited Dec 31 '18 at 5:42

Ingo Bürk

10.8k53575

edited Dec 31 '18 at 5:42

Ingo Bürk

10.8k53575

asked Dec 30 '18 at 5:01

Mr. A

asked Dec 30 '18 at 5:01

Mr. A

asked Dec 30 '18 at 5:01

Mr. A

1

how is this question related to Angular?

– JulianG
Dec 30 '18 at 19:52

add a comment |

1

how is this question related to Angular?

– JulianG
Dec 30 '18 at 19:52

how is this question related to Angular?

– JulianG
Dec 30 '18 at 19:52

add a comment |

3 Answers
3

active

oldest

votes

Use every with arrow function (for brevity) on questListArray, like so:

areAllMandatoriesFalse() {

   if (this.quesListArray.every(item => !item.Mandatory)) {

     alert("All are false");

   }

   else {

      alert("Not all are false");

   }

}

DEMO

edited Dec 31 '18 at 5:40

answered Dec 30 '18 at 5:19

Vega

12.8k113655

@Mr.A: please do practise to upvote the answer if helpfull and mark as accepted if answer is perfect.

– baj9032
Dec 30 '18 at 6:01

add a comment |

use 'every'.
for example:

function isBelowThreshold(currentValue) {

    return currentValue < 40;

}



var array = [1, 30, 39, 29, 10, 13];



console.log(array.every(isBelowThreshold));

// expected output: true

I hope my help is effective ツ

answered Dec 30 '18 at 7:13

user10780188

I already suggested using "every". In less than 4 min two upvotes are suspisious

– Vega
Dec 30 '18 at 7:18

I got into this problem today at the company. I answered this answer and two of my colleagues liked it... :) @Vega

– user10780188
Dec 30 '18 at 7:26

add a comment |

Try this:

checkPropAreFalse() {

    let MandatoryFlag = true;

    for (let index = 0; index < this.quesListArray.length; index++) {

      const element = this.quesListArray[index];

      if (!element.Mandatory) {

        continue;

      } else {

        MandatoryFlag = false;

        break;

      }

    }

    return MandatoryFlag;

  }

Call Method from your file:

const responce = this.checkPropAreFalse();

answered Dec 30 '18 at 5:29

baj9032

1,0351827

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

Use every with arrow function (for brevity) on questListArray, like so:

areAllMandatoriesFalse() {

   if (this.quesListArray.every(item => !item.Mandatory)) {

     alert("All are false");

   }

   else {

      alert("Not all are false");

   }

}

DEMO

edited Dec 31 '18 at 5:40

answered Dec 30 '18 at 5:19

Vega

12.8k113655

@Mr.A: please do practise to upvote the answer if helpfull and mark as accepted if answer is perfect.

– baj9032
Dec 30 '18 at 6:01

add a comment |

Use every with arrow function (for brevity) on questListArray, like so:

areAllMandatoriesFalse() {

   if (this.quesListArray.every(item => !item.Mandatory)) {

     alert("All are false");

   }

   else {

      alert("Not all are false");

   }

}

DEMO

edited Dec 31 '18 at 5:40

answered Dec 30 '18 at 5:19

Vega

12.8k113655

@Mr.A: please do practise to upvote the answer if helpfull and mark as accepted if answer is perfect.

– baj9032
Dec 30 '18 at 6:01

add a comment |

Use every with arrow function (for brevity) on questListArray, like so:

areAllMandatoriesFalse() {

   if (this.quesListArray.every(item => !item.Mandatory)) {

     alert("All are false");

   }

   else {

      alert("Not all are false");

   }

}

DEMO

edited Dec 31 '18 at 5:40

answered Dec 30 '18 at 5:19

Vega

12.8k113655

Use every with arrow function (for brevity) on questListArray, like so:

areAllMandatoriesFalse() {

   if (this.quesListArray.every(item => !item.Mandatory)) {

     alert("All are false");

   }

   else {

      alert("Not all are false");

   }

}

DEMO

edited Dec 31 '18 at 5:40

answered Dec 30 '18 at 5:19

Vega

12.8k113655

edited Dec 31 '18 at 5:40

answered Dec 30 '18 at 5:19

Vega

12.8k113655

answered Dec 30 '18 at 5:19

Vega

12.8k113655

answered Dec 30 '18 at 5:19

Vega

12.8k113655

@Mr.A: please do practise to upvote the answer if helpfull and mark as accepted if answer is perfect.

– baj9032
Dec 30 '18 at 6:01

add a comment |

@Mr.A: please do practise to upvote the answer if helpfull and mark as accepted if answer is perfect.

– baj9032
Dec 30 '18 at 6:01

@Mr.A: please do practise to upvote the answer if helpfull and mark as accepted if answer is perfect.

– baj9032
Dec 30 '18 at 6:01

add a comment |

use 'every'.
for example:

function isBelowThreshold(currentValue) {

    return currentValue < 40;

}



var array = [1, 30, 39, 29, 10, 13];



console.log(array.every(isBelowThreshold));

// expected output: true

I hope my help is effective ツ

answered Dec 30 '18 at 7:13

user10780188

I already suggested using "every". In less than 4 min two upvotes are suspisious

– Vega
Dec 30 '18 at 7:18

I got into this problem today at the company. I answered this answer and two of my colleagues liked it... :) @Vega

– user10780188
Dec 30 '18 at 7:26

add a comment |

use 'every'.
for example:

function isBelowThreshold(currentValue) {

    return currentValue < 40;

}



var array = [1, 30, 39, 29, 10, 13];



console.log(array.every(isBelowThreshold));

// expected output: true

I hope my help is effective ツ

answered Dec 30 '18 at 7:13

user10780188

I already suggested using "every". In less than 4 min two upvotes are suspisious

– Vega
Dec 30 '18 at 7:18

I got into this problem today at the company. I answered this answer and two of my colleagues liked it... :) @Vega

– user10780188
Dec 30 '18 at 7:26

add a comment |

use 'every'.
for example:

function isBelowThreshold(currentValue) {

    return currentValue < 40;

}



var array = [1, 30, 39, 29, 10, 13];



console.log(array.every(isBelowThreshold));

// expected output: true

I hope my help is effective ツ

answered Dec 30 '18 at 7:13

user10780188

use 'every'.
for example:

function isBelowThreshold(currentValue) {

    return currentValue < 40;

}



var array = [1, 30, 39, 29, 10, 13];



console.log(array.every(isBelowThreshold));

// expected output: true

I hope my help is effective ツ

answered Dec 30 '18 at 7:13

user10780188

answered Dec 30 '18 at 7:13

user10780188

answered Dec 30 '18 at 7:13

user10780188

answered Dec 30 '18 at 7:13

user10780188

I already suggested using "every". In less than 4 min two upvotes are suspisious

– Vega
Dec 30 '18 at 7:18

I got into this problem today at the company. I answered this answer and two of my colleagues liked it... :) @Vega

– user10780188
Dec 30 '18 at 7:26

add a comment |

I already suggested using "every". In less than 4 min two upvotes are suspisious

– Vega
Dec 30 '18 at 7:18

I got into this problem today at the company. I answered this answer and two of my colleagues liked it... :) @Vega

– user10780188
Dec 30 '18 at 7:26

I already suggested using "every". In less than 4 min two upvotes are suspisious

– Vega
Dec 30 '18 at 7:18

I got into this problem today at the company. I answered this answer and two of my colleagues liked it... :) @Vega

– user10780188
Dec 30 '18 at 7:26

add a comment |

Try this:

checkPropAreFalse() {

    let MandatoryFlag = true;

    for (let index = 0; index < this.quesListArray.length; index++) {

      const element = this.quesListArray[index];

      if (!element.Mandatory) {

        continue;

      } else {

        MandatoryFlag = false;

        break;

      }

    }

    return MandatoryFlag;

  }

Call Method from your file:

const responce = this.checkPropAreFalse();

answered Dec 30 '18 at 5:29

baj9032

1,0351827

add a comment |

Try this:

checkPropAreFalse() {

    let MandatoryFlag = true;

    for (let index = 0; index < this.quesListArray.length; index++) {

      const element = this.quesListArray[index];

      if (!element.Mandatory) {

        continue;

      } else {

        MandatoryFlag = false;

        break;

      }

    }

    return MandatoryFlag;

  }

Call Method from your file:

const responce = this.checkPropAreFalse();

answered Dec 30 '18 at 5:29

baj9032

1,0351827

add a comment |

Try this:

checkPropAreFalse() {

    let MandatoryFlag = true;

    for (let index = 0; index < this.quesListArray.length; index++) {

      const element = this.quesListArray[index];

      if (!element.Mandatory) {

        continue;

      } else {

        MandatoryFlag = false;

        break;

      }

    }

    return MandatoryFlag;

  }

Call Method from your file:

const responce = this.checkPropAreFalse();

answered Dec 30 '18 at 5:29

baj9032

1,0351827

Try this:

checkPropAreFalse() {

    let MandatoryFlag = true;

    for (let index = 0; index < this.quesListArray.length; index++) {

      const element = this.quesListArray[index];

      if (!element.Mandatory) {

        continue;

      } else {

        MandatoryFlag = false;

        break;

      }

    }

    return MandatoryFlag;

  }

Call Method from your file:

const responce = this.checkPropAreFalse();

answered Dec 30 '18 at 5:29

baj9032

1,0351827

answered Dec 30 '18 at 5:29

baj9032

1,0351827

answered Dec 30 '18 at 5:29

baj9032

1,0351827

answered Dec 30 '18 at 5:29

baj9032

1,0351827

add a comment |

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