w3resource

JavaScript: Concatenate a specific string for a specific number of times

JavaScript String: Exercise-13 with Solution

Write a JavaScript function to concatenates a given string n times (default is 1).

Test Data:
console.log(repeat('Ha!'));
console.log(repeat('Ha!',2));
console.log(repeat('Ha!',3));
"Ha!"
"Ha!Ha!"
"Ha!Ha!Ha!"

Pictorial Presentation:

JavaScript: Concatenate a specific string for a specific number of times

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript program to concatenates a given string n times (default is 1).</title>
</head>
<body>
</body>
</html>

JavaScript Code:

repeat = function repeat(str, count) {
    if(typeof(count) == "undefined") {
    count =1;
  }
  return count < 1 ? '' : new Array(count + 1).join(str);
    }
console.log(repeat('Ha!'));
console.log(repeat('Ha!',2));
console.log(repeat('Ha!',3));

Sample Output:

Ha!
Ha!Ha!
Ha!Ha!Ha!

Flowchart:

Flowchart: JavaScript- Concatenate a specific  string for a specific number of times

Live Demo:

See the Pen JavaScript Concatenate a specific string for a specific number of times - string-ex-13 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function to uncamelize a string.
Next: Write a JavaScript function to insert a string within a string at a particular position (default is 1).

What is the difficulty level of this exercise?



JavaScript: Tips of the Day

JavaScript: Implicit type coercion

function sum(a, b) {
  return a + b;
}

sum(1, '2');

JavaScript is a dynamically typed language: we don't specify what types certain variables are. Values can automatically be converted into another type without you knowing, which is called implicit type coercion. Coercion is converting from one type into another.

In this example, JavaScript converts the number 1 into a string, in order for the function to make sense and return a value. During the addition of a numeric type (1) and a string type ('2'), the number is treated as a string. We can concatenate strings like "Hello" + "World", so what's happening here is "1" + "2" which returns "12".

Ref: https://bit.ly/323Y0P6