JavaScript: Concatenate two strings and return the result

JavaScript Basic: Exercise-64 with Solution

Write a JavaScript program to concatenate two strings and return the result. If the length of the strings does not match, then remove the characters from the longer string.

For example "Python" and "JS" will be "onJS".

This JavaScript program concatenates two strings and, if their lengths differ, trims the longer string to match the length of the shorter one before concatenation.

Visual Presentation:

Sample Solution:

JavaScript Code:

// Define a function named str_con_cat with parameters str1 and str2
function str_con_cat(str1, str2) {
    // Calculate the minimum length of str1 and str2
    const m = Math.min(str1.length, str2.length);
  
    // Use substring to concatenate the common characters from the end of both strings
    return str1.substring(str1.length - m) + str2.substring(str2.length - m);
}

// Call the function with sample arguments and log the results to the console
console.log(str_con_cat("Python", "JS"));
console.log(str_con_cat("ab", "cdef")); 

Output:

onJS
abef

Live Demo:

See the Pen JavaScript - Concatenate two strings and return the result - basic-ex-64 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

 // Define a function named str_con_cat with parameters str1 and str2
const str_con_cat = (str1, str2) => {
    // Use Math.min to find the minimum length between str1 and str2
    const m = Math.min(str1.length, str2.length);
    // Concatenate substrings using substring method and return the result
    return str1.substring(str1.length - m) + str2.substring(str2.length - m);
};

// Call the function with sample arguments and log the results to the console
console.log(str_con_cat("Python", "JS"));
console.log(str_con_cat("ab", "cdef"));

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