JavaScript: Create a string using the middle three characters of a given string of odd length

JavaScript Basic: Exercise-63 with Solution

Write a JavaScript program to create a string using the middle three characters of a given string of odd length. The string length must be greater than or equal to three.

This JavaScript program extracts and creates a new string consisting of the middle three characters from an input string of odd length, ensuring the input string length is at least three.

Visual Presentation:

Sample Solution:

JavaScript Code:

// Define a function named middle_three with parameter str
function middle_three(str) {
    // Check if the length of str is odd
    if (str.length % 2 !== 0) {
        // Calculate the middle index for odd-length strings
        mid = (str.length + 1) / 2;
        // Use slice to get the middle three characters and return
        return str.slice(mid - 2, mid + 1);
    }
    // Return str if its length is not odd
    return str;
}

// Call the function with sample arguments and log the results to the console
console.log(middle_three('abcdefg'));
console.log(middle_three('HTML5'));
console.log(middle_three('Python'));
console.log(middle_three('PHP'));
console.log(middle_three('Exercises')); 

Output:

cde
TML
Python
PHP
rci

Live Demo:

See the Pen JavaScript - Create a string using the middle three characters of a given string of odd length - basic-ex-63 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

// Define a function named middle_three with parameter str
const middle_three = (str) => {
    // Check if the length of str is odd
    if (str.length % 2 !== 0) {
        // Calculate the middle index
        const mid = (str.length + 1) / 2;
        // Use slice to get the middle three characters and return the result
        return str.slice(mid - 2, mid + 1);
    }
    // Return str if its length is not odd
    return str;
};

// Call the function with sample arguments and log the results to the console
console.log(middle_three('abcdefg'));
console.log(middle_three('HTML5'));
console.log(middle_three('Python'));
console.log(middle_three('PHP'));
console.log(middle_three('Exercises'));

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