JavaScript: Concatenate two strings and return the result

Last update on May 30 2022 10:05:29 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-64 with Solution

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

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

Pictorial Presentation:

JavaScript: Concatenate two strings and return the result

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to concatenate two strings and return the result. If the length of the strings are not same then remove the characters from the longer string.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function str_con_cat(str1, str2) {
  const m = Math.min(str1.length, str2.length);

  return str1.substring(str1.length - m) + str2.substring(str2.length - m);
}

console.log(str_con_cat("Python", "JS"));
console.log(str_con_cat("ab", "cdef"));

Sample Output:

onJS
abef

Flowchart:

ES6 Version:

function str_con_cat(str1, str2) {
  const m = Math.min(str1.length, str2.length);

  return str1.substring(str1.length - m) + str2.substring(str2.length - m);
}

console.log(str_con_cat("Python", "JS"));
console.log(str_con_cat("ab", "cdef"));

Live Demo:

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

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Next: Write a JavaScript program to test if a string end with "Script". The string length must be greater or equal to 6.

JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04