JavaScript: Middle character(s) of a string

JavaScript Math: Exercise-86 with Solution

Get Middle Character(s) of String

Write a JavaScript program to get the middle character(s) from a given string.

Test Data:
("abcd") -> "bc"
("abc") -> "b"
("JavaScript") -> "Sc"

Sample Solution:

JavaScript Code:

/**
 * Function to find the middle character(s) of a given string.
 * @param {string} text - The input string.
 * @returns {string} - The middle character(s) of the string.
 */
function test(text) {
    // Get the length of the input string
    var text_len = text.length;
    // Check if the length of the string is odd or even
    if (text_len % 2 != 0) {
        // Calculate the start index for odd-length strings
        let start = (text_len - 1) / 2;
        // Return the middle character
        return text.slice(start, start + 1);
    } else {
        // Calculate the start index for even-length strings
        let start = text_len / 2 - 1;
        // Return the middle two characters for even-length strings
        return text.slice(start, start + 2);
    }
}
// Test cases
// Assign value to text
text = "abcd";
// Print the original string
console.log("Original string: " + text);
// Print the middle character(s) of the said string
console.log("Middle character(s) of the said string: " + test(text));
// Repeat the above steps for different values of text
text = "abc";
console.log("Original string: " + text);
console.log("Middle character(s) of the said string: " + test(text));
text = "JavaScript";
console.log("Original string: " + text);
console.log("Middle character(s) of the said string: " + test(text));

Output:

Original string: abcd
Middle character(s) of the said string: bc
Original string: abc
Middle character(s) of the said string: b
Original string: JavaScript
Middle character(s) of the said string: Sc

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-86 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that returns the middle character(s) of a string depending on whether its length is odd or even.
• Write a JavaScript function that calculates the correct starting index and length to extract the middle part of a string.
• Write a JavaScript function that handles edge cases like empty strings or single-character strings when determining the middle characters.
• Write a JavaScript function that returns the middle characters in uppercase for consistency in output.

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