JavaScript: Repeat a string a specified times

Last update on May 30 2022 10:00:41 (UTC/GMT +8 hours)

JavaScript String: Exercise-21 with Solution

Write a JavaScript function to repeat a string a specified times.

Test Data:
console.log(repeat_string('a', 4));
console.log(repeat_string('a'));
Output:
"aaaa"
"Error in string or count."

Pictorial Presentation:

JavaScript: Repeat a string a specified times

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Write a JavaScript function to repeat a string a specified times.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function repeat_string(string, count) 
  {
    if ((string == null) || (count < 0) || (count === Infinity) || (count == null))
      {
        return('Error in string or count.');
      }
        count = count | 0; // Floor count.
    return new Array(count + 1).join(string);
  }

console.log(repeat_string('a', 4));
console.log(repeat_string('a'));
console.log(repeat_string('a', -2));
console.log(repeat_string('a', Infinity));

Sample Output:

aaaa
Error in string or count.
Error in string or count.
Error in string or count.

Flowchart:

Live Demo:

See the Pen JavaScript - common-editor-exercises by w3resource (@w3resource) on CodePen.

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Next:Write a JavaScript function to get a part of string after a specified character.

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