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?

Test your Programming skills with w3resource's quiz.



JavaScript: Tips of the Day

var functionName = function() {} vs function functionName() {}

The difference is that functionOne is a function expression and so only defined when that line is reached, whereas functionTwo is a function declaration and is defined as soon as its surrounding function or script is executed (due to hoisting).

For example, a function expression:

// TypeError: functionOne is not a function
functionOne();

var functionOne = function() {
  console.log("Hello!");
};

Historically, function declarations defined within blocks were handled inconsistently between browsers. Strict mode (introduced in ES5) resolved this by scoping function declarations to their enclosing block.

'use strict';    
{ // note this block!
  function functionThree() {
    console.log("Hello!");
  }
}
functionThree(); // ReferenceError

Ref: https://bit.ly/2zMAj1O