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How to Check for an Empty String in JavaScript
source link: https://www.laravelcode.com/post/how-to-check-for-an-empty-string-in-javascript
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How to Check for an Empty String in JavaScript
Use the === Operator
You can use the strict equality operator (===) to check whether a string is empty or not.
The comparsion str === "" will only return true if the data type of the value is string and it is not empty, otherwise return false as demonstrated in the following example:
<script>
if(str === ""){
// string is empty, do something
}
// Some test cases
alert(2 === ""); // Outputs: flase
alert(0 === "") // Outputs: false
alert("" === "") // Outputs: true
alert("Hello World!" === "") // Outputs: false
alert(false === "") // Outputs: false
alert(null === "") // Outputs: false
alert(undefined === "") // Outputs: false
</script>Author : Harsukh Makwana
Hi, My name is Harsukh Makwana. i have been work with many programming language like php, python, javascript, node, react, anguler, etc.. since last 5 year. if you have any issue or want me hire then contact me on [email protected]
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