Check string empty using length property in JavaScript

Energetic Elk answered on July 7, 2022 Popularity 1/10 Helpfulness 1/10

answer Check string empty using length property in JavaScript

related How to Check for an Empty String in JavaScript with the length Property

Check string empty using length property in JavaScript

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// Using the string length property to check empty string
let string1 = "";           // Empty string
let string2 = " ";          // String with one space
let string3 = "JavaScript"; // Non-empty string
let string4 = "0";          // String with zero
let string5 = "false";      // String with false

console.log(string1.length === 0); // Output: true
console.log(string2.length === 0); // Output: false	
console.log(string3.length === 0); // Output: false
console.log(string4.length === 0); // Output: false
console.log(string5.length === 0); // Output: false

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: www.rajamsr.com

Tags: javascript string using

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Contributed on Mar 08 2024

Energetic Elk

0 Answers Avg Quality 2/10

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How to Check for an Empty String in JavaScript with the length Property

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// In this method, we will check for the length of the string by adding the length property.
// We'll check if the length is equal to 0. If it’s equal to zero,
// it means that the string is empty, as we can see below:

let myStr = "";

if (myStr.length === 0) {
  console.log("This is an empty string!");
}

/*
The above will return this:

"This is an empty string!"

But this approach unfortunately might not work in all situations.
For example, if we have a string that has white spaces as seen below:
*/


let myStr = "  ";

if (myStr.length === 0) {
  console.log("This is an empty string!");
}else{
  console.log("This is NOT an empty string!");
}

/*
This will return:

"This is NOT an empty string!"

We can easily fix this error by first removing the white spaces using the trim() method
before checking for the length of such string to see if it’s empty as seen below:
*/


let myStr = "  ";

if (myStr.trim().length === 0) {
  console.log("This is an empty string!");
}else{
  console.log("This is NOT an empty string!");
}

/*
This will now return the following:

"This is an empty string!"

Note: If the value is null, this will throw an error because the length property does
not work for null.

To fix this, we can add an argument that checks if the value's type is a string and
skips this check if it is not:
*/


let myStr = null;

if (typeof myStr === "string" && myStr.trim().length === 0) {
  console.log("This is an empty string!");
}

Popularity 3/10 Helpfulness 4/10 Language javascript

Source: www.freecodecamp.org

Tags: string javascript

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Contributed on Jul 07 2022

OHIOLee

0 Answers Avg Quality 2/10

Check string empty using length property in JavaScript

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How to Check for an Empty String in JavaScript with the length Property

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