JavaScript: Check if a string ends with specified suffix

JavaScript String: Exercise-30 with Solution

String Ends With

Write a JavaScript function that checks whether a string ends with a specified suffix.

Test Data :
console.log(string_endsWith('JS PHP PYTHON','PYTHON'));
true
console.log(string_endsWith('JS PHP PYTHON',''));
false

Visual Presentation:

Sample Solution:

JavaScript Code:

// Function to check if a string ends with a specified suffix
function string_endsWith(str, suffix) 
{
    // Check if either string is null or empty
    if (((str === null) || (str === '')) || ((suffix === null) || (suffix === '')))
    {
        return false; // Return false if either string is null or empty
    }
    else
    {     
        // Convert both strings to type string
        str = str.toString();
        suffix = suffix.toString();
    }
    // Check if the suffix is found at the end of the string
    return str.indexOf(suffix, str.length - suffix.length) !== -1;
}

// Example usage of the string_endsWith function
console.log(string_endsWith('JS PHP PYTHON', 'PYTHON')); // Output: true
console.log(string_endsWith('JS PHP PYTHON', '')); // Output: false

Output:

true
false

Explanation:

In the exercise above,

• The function "string_endsWith()" is defined, which takes two parameters: `str` (the main string) and 'suffix' (the string to check for at the end).
• It first checks if either 'str' or 'suffix' is null or empty. If so, it returns 'false'.
• If both 'str' and 'suffix' are non-empty strings, they are converted to strings if they're not already strings.
• The function then checks if the 'suffix' is found at the end of the 'str' using the 'indexOf' method.
• If the 'suffix' is found at the end of the 'str', the function returns 'true'; otherwise, it returns 'false'.

Flowchart:

Live Demo:

See the Pen JavaScript Check if a string ends with specified suffix - string-ex-30 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that checks if a string ends with a given substring using slice() comparisons.
• Write a JavaScript function that uses the built-in endsWith() method if available, with a fallback implementation.
• Write a JavaScript function that validates the input and returns true if the string ends with the target substring.
• Write a JavaScript function that handles edge cases when the search string is empty or longer than the input.

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