How do I check if a value is an empty or whitespace-only string without using regular expressions?
Gable E
To check if a value is an empty or whitespace-only string in JavaScript without using regular expressions, you can follow these steps:
1. Trim the value: Use thetrim() method to remove leading and trailing whitespace from the string.
2. Check the length: Use thelength property to determine the length of the trimmed string. If the length is 0, then the string is empty.
Here's an example implementation:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
function isEmptyOrWhitespace(value) {
// Trim the value to remove leading and trailing whitespace
const trimmedValue = value.trim();
// Check if the trimmed value is empty or whitespace-only
return trimmedValue.length === 0;
}
// Example usage
console.log(isEmptyOrWhitespace('')); // true
console.log(isEmptyOrWhitespace(' ')); // true
console.log(isEmptyOrWhitespace(' Hello ')); // false
console.log(isEmptyOrWhitespace('Hello, World!')); // false
TheisEmptyOrWhitespace() function takes a value as input and returnstrue if the value is an empty or whitespace-only string, andfalse otherwise. It trims the input value usingtrim() to remove leading and trailing whitespace, and then checks if the trimmed value has a length of 0. If it does, it means the string is empty or contains only whitespace.
By using this approach, you can determine if a string is empty or whitespace-only without relying on regular expressions.
