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javascript check for undefined

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Grepper answered on July 22, 2019 Popularity 10/10 Helpfulness 10/10

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javascript check for undefined

Comment

if (typeof myVariable === 'undefined'){
    //myVariable is undefined
}

Popularity 10/10 Helpfulness 10/10 Language javascript

Source: Grepper

Tags: javascript

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Contributed on Jul 22 2019

Grepper

0 Answers Avg Quality 2/10

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javascript if undefined

Comment

if(typeof comment === 'undefined') {

  alert('Variable "comment" is undefined.');

} else if(comment === null){

  alert('Variable "comment" is null.');

}

Popularity 10/10 Helpfulness 10/10 Language javascript

Source: www.tutorialrepublic.com

Tags: javascript j

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Contributed on Mar 25 2020

Tame Toucan

0 Answers Avg Quality 2/10

test if is undefined javascript

Comment

let id;

if(typeof id === 'undefined') {
    console.log("id is undefined...");
}

Popularity 10/10 Helpfulness 8/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 10 2020

experimental

0 Answers Avg Quality 2/10

check undefined in javascript

Comment

if (typeof myVariable === 'undefined'){
    //myVariable is undefined
}

Popularity 10/10 Helpfulness 7/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 29 2021

Grepper420

0 Answers Avg Quality 2/10

javascript check if undefined

Comment

let myVar;

if (myVar === undefined){}
  //!! Note: myVar == undefined would also check wether myVar is null 

//alternatively
if (typeof myVar === 'undefined'){ }

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jun 16 2022

Zenity Code

0 Answers Avg Quality 2/10

javascript is undefined

Comment

if (typeof variable === 'undefined') {
    // variable is undefined
}

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Dec 10 2022

Cloud

0 Answers Avg Quality 2/10

js test undefined

Comment

if (typeof something != "undefined") {
    // ...
}

Popularity 9/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Oct 09 2021

cadot.eu

0 Answers Avg Quality 2/10

js check if undefined

Comment

let foo = undefined
//will return true
typeof foo === 'undefined'

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 15 2020

Prickly Peafowl

0 Answers Avg Quality 2/10

javascript check undefined

Comment

if(myVar === null) {
	console.log("Element is undefined");
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 30 2020

Batman

0 Answers Avg Quality 2/10

javascript test if undefined

Comment

if (angular.isDefined(var){
    //myVariable is undefined
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jun 07 2021

Sam H

0 Answers Avg Quality 2/10

javascript check for undefined

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