JavaScript: Check whether a string is blank or not

JavaScript String: Exercise-2 with Solution

Check Blank String

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

Visual Presentation:

Sample Solution:

JavaScript Code:

// Define a function called is_Blank that checks if the input string is blank
is_Blank =  function(input) {
    // Check if the length of the input string is 0
    if (input.length === 0)
        // If the length is 0, return true indicating that the string is blank
        return true;
    else
        // If the length is not 0, return false indicating that the string is not blank
        return false;
}
// Print the result of calling is_Blank with an empty string
console.log(is_Blank(''));
// Print the result of calling is_Blank with a non-empty string ('abc')
console.log(is_Blank('abc'));

Output:

true
false

Explanation:

In the exercise above,

• "is_Blank()" function is defined without input validation.
• Inside the function, it checks if the length of the input string is equal to 0, indicating that the string is empty.
• If the length is 0, it returns 'true', indicating that the string is blank.
• If the length is not 0, it returns 'false', indicating that the string is not blank.
• The code then tests the function by calling it with an empty string '' and a non-empty string 'abc'.
• It prints the result of each function call using console.log.

Flowchart:

Live Demo:

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

For more Practice: Solve these Related Problems:

• Write a JavaScript function that checks if a string is empty or contains only whitespace using trim().
• Write a JavaScript function that returns true if a string is blank and false if it contains any non-space characters.
• Write a JavaScript function that uses regular expressions to test for blank strings.
• Write a JavaScript function that validates a string input and returns a boolean indicating its blankness.

Go to:

• JavaScript String Exercises Home ↩
• JavaScript Exercises Home ↩

PREV : Check String Input.
NEXT : String to Array of Words.

Improve this sample solution and post your code through Disqus.