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A string length which contains one space is always equal to 1:
alert('My str length: ' + str.length); The space is a character, so:
str = " "; alert('My str length:' + str.length); // My str length: 3 How can I make a distinction between an empty string and a string which contains only spaces? How can I detect a string which contain only spaces?
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Using isspace() isspace() function of string class returns True if string contains only white spaces. So we can use this to check if string is empty or contain white spaces only i.e.
In order to check if a String has only unicode digits or space in Java, we use the isDigit() method and the charAt() method with decision making statements. The isDigit(int codePoint) method determines whether the specific character (Unicode codePoint) is a digit. It returns a boolean value, either true or false.
In C#, IsNullOrWhiteSpace() is a string method. It is used to check whether the specified string is null or contains only white-space characters. A string will be null if it has not been assigned a value or has explicitly been assigned a value of null.
PHP | ctype_space() Function A ctype_space() function in PHP is used to check whether each and every character of a string is whitespace character or not. It returns True if the all characters are white space, else returns False.
To achieve this you can use a Regular Expression to remove all the whitespace in the string. If the length of the resulting string is 0, then you can be sure the original only contained whitespace. Try this:
var str = " "; if (!str.replace(/\s/g, '').length) { console.log('string only contains whitespace (ie. spaces, tabs or line breaks)'); }If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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