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JavaScript: Check whether a string is blank or not

JavaScript String: Exercise-2 with Solution

Write a JavaScript function to check whether a string is blank or not.

Test Data :
console.log(is_Blank(''));
console.log(is_Blank('abc'));
true
false

Pictorial Presentation:

JavaScript: Check whether a string is blank or not

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS string : is blank</title>
</head>
<body>
</body>
</html>

JavaScript Code:

is_Blank =  function(input) {
        if (input.length === 0)
        return true;
        else 
        return false;
      }
console.log(is_Blank(''));
console.log(is_Blank('abc'));

Sample Output:

true
false

Flowchart:

Flowchart: JavaScript- Check whether a string is blank or not

Live Demo:

See the Pen JavaScript Check whether a string is blank or not - string-ex-2 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

Ref: https://bit.ly/3fFFgZv