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

Last update on May 30 2022 10:01:50 (UTC/GMT +8 hours)

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:

Live Demo:

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

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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).

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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