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javascript check if undefined or null or empty string

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Scriper answered on October 23, 2019 Popularity 10/10 Helpfulness 3/10

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javascript check if undefined or null or empty string

Comment

// simple check do the job
if (myString) {
 // comes here either myString is not null,
 // or myString is not undefined,
 // or myString is not '' (empty).
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript null string undefined

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Contributed on May 02 2020

Scriper

0 Answers Avg Quality 2/10

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javascript check if undefined or null

Comment

if( typeof myVar === 'undefined' || myVar === null ){
    // myVar is undefined or null
}

Popularity 10/10 Helpfulness 8/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 23 2019

Grepper

0 Answers Avg Quality 2/10

How to Check for a Null or Empty String in JavaScript

Comments(1)

let myStr = null;

if (myStr === null || myStr.trim() === "") {
  console.log("This is an empty string!");
} else {
  console.log("This is not an empty string!");
}

/*
This will return:

"This is an empty string!"
*/

Popularity 10/10 Helpfulness 8/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Jul 07 2022

OHIOLee

0 Answers Avg Quality 2/10

javascript syntax for check null or undefined or empty

Comment

if (typeof value !== 'undefined' && value) {
    //deal with value'
};

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Aug 29 2020

Different Dugong

0 Answers Avg Quality 2/10

Check for a Null or Empty String in JavaScript

Comment

let myStr = null;

if (myStr === null || myStr.trim() === "") {
  console.log("This is an empty string!");
} else {
  console.log("This is not an empty string!");
}

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Jul 07 2022

Adventurous Ant

0 Answers Avg Quality 2/10

js if string not empty

Comment

if (!str.length) { ...

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Feb 26 2021

Borma

0 Answers Avg Quality 2/10

javascript string null or empty

Comment

function isNullOrEmpty(str) {
  return str === null || str.trim() === '';
}

// Usage example
const myString = null;
const result = isNullOrEmpty(myString);
console.log(result); // Output: true

Popularity 9/10 Helpfulness 4/10 Language javascript

Source: Grepper

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Contributed on Sep 12 2023

YOU.com

0 Answers Avg Quality 2/10

javascript check if variable is empty

Comment

if( value ) {
  //
}

/**
* This will evaluate to true if value is not:
* null
* undefined
* NaN
* empty string ("")
* 0
* false
*/

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: is-empty is-empt

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Contributed on Nov 25 2020

MatrixZA

0 Answers Avg Quality 2/10

javascript check if string is empty

Comment

var string = "not empty";
if(string == ""){
  console.log("Please Add");
}
else{
  console.log("You can pass"); // console will log this msg because our string is not empty
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: is-empty is-empt

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Contributed on Jun 19 2021

Programming Is Fun

0 Answers Avg Quality 2/10

javascript check if Empty string, undefined, null

Comment

Use for Empty string, undefined, null, ...
//To check for a truthy value:

if (strValue) {
    // strValue was non-empty string, true, 42, Infinity, [], ...
}

//To check for a falsy value:
if (!strValue) {
    // strValue was empty string, false, 0, null, undefined, ...
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jul 27 2022

Obedient Osprey

0 Answers Avg Quality 2/10

javascript check if undefined or null or empty string

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