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:

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:

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
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