https://stackoverflow.com › questions › 154059
How do I check for an empty/undefined/null string in JavaScript?Empty string (only!) To check for exactly an empty string, compare for strict equality against "" using the === operator: if (strValue === "") { // strValue was empty string } To check for not an empty string strictly, use the !== operator: if (strValue !== "") { // strValue was not an empty string }
If you want to know if it's an empty string use === instead of ==. This is because === will only return true if the values on both sides are of the same type, in this case a string. for example: (false == "") will return true, and (false === "") will return false.
1. If we split the condition into its two relevant parts, you first have null || "". The result of that will be equal to the empty string "". Then you have value == ""., which will be false if value is null. The correct way to write your condition is value == null || value == "". answered Jun 19, 2018 at 13:52.
https://stackoverflow.com › questions › 2381456
Javascript: How to check if a string is empty? - Stack OverflowIf you want to know if it's an empty string use === instead of ==. This is because === will only return true if the values on both sides are of the same type, in this case a string. for example: (false == "") will return true, and (false === "") will return false.
https://www.freecodecamp.org › news › javascript-check-empty-string-checking-null-or-empty...
JavaScript Check Empty String – Checking Null or Empty in JSHow to Check for an Empty String in JavaScript with the length Property. In this first 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 = "";
https://www.freecodecamp.org › news › check-if-string-is-empty-or-null-javascript
How to Check if a String is Empty or Null in JavaScript – JS TutorialOne way to check for an empty or null string is to use the if statement and the typeof operator. Here's an example: let str = ""; if (typeof str === "string" && str.length === 0) { . console.log("The string is empty"); } else if (str === null) { . console.log("The string is null"); } else { . console.log("The string is not empty or null"); }
https://bobbyhadz.com › blog › javascript-check-if-string-is-empty
How to check if a String is Empty in JavaScript | bobbyhadz# Check if a String is Empty in JavaScript. Use the length property on the string to check if it is empty. If the string's length is equal to 0, then it's empty, otherwise, it isn't empty.
https://sebhastian.com › javascript-check-if-string-is-empty
Javascript Check if String is Empty - sebhastianHow to Check for an Empty String in Javascript. To check for an empty string, you need to use the equality === operator and see if the variable value matches your definition of empty. For example, here’s how to check if a string is undefined: let str1; console.log(str1 === undefined); // true.
https://robiul.dev › how-to-check-if-a-string-is-empty-in-javascript
How to Check if a String is Empty in JavaScript - RoblogThe simplest way of checking if a string is empty in JavaScript is the length property. By comparing the length of a string to zero, we can determine if it is empty or not. let myStr = '' if (myStr.length === 0) { console.log('This is a javascript empty string!') }
https://www.squash.io › how-to-check-for-an-empty-string-in-javascript
How To Check For An Empty String In Javascript - squash.ioLearn how to check for an empty string in JavaScript using simple techniques. Find out if a string is undefined, null, or empty.
https://www.techiedelight.com › check-string-empty-null-undefined-javascript
Check a string for empty, null, or undefined in JavaScriptThere are several ways to check if a string is empty or null or undefined in JavaScript. Here are some of the most practical ways, along with examples: 1. Using logical NOT operator. The logical NOT (!) operator converts any value to a boolean, and returns the opposite of its truthiness.
https://www.tutorialstonight.com › check-if-string-is-empty-javascript
Check if String is Empty JavaScript - Tutorials TonightLearn how to check if a string is empty in JavaScript. Explore different methods, including using the length property, trim() method, and regular expressions
