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JavaScript: Create a new string of specified copies of a given string

JavaScript Basic: Exercise-57 with Solution

Write a JavaScript program to create a new string of specified copies (positive number) of a given string.

Pictorial Presentation:

JavaScript: Create a new string of specified copies of a given string

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to create a new string of specified copies of a given string.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function string_copies (str, n) 
{
  if (n < 0)
    return false;
  else
  return str.repeat(n);
}
console.log(string_copies("abc", 5));
console.log(string_copies("abc", 0));
console.log(string_copies("abc", -2));

Sample Output:

abcabcabcabcabc

false

Flowchart:

Flowchart: JavaScript - Create a new string of specified copies of a given string

ES6 Version:

function string_copies (str, n) 
{
  if (n < 0)
    return false;
  else
  return str.repeat(n);
}
console.log(string_copies("abc", 5));
console.log(string_copies("abc", 0));
console.log(string_copies("abc", -2));

Live Demo:

See the Pen JavaScript - create a new string of specified copies (positive number) of a given string. - basic-ex-57 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to divide two positive numbers and return a string with properly formatted commas.
Next: Write a JavaScript program to create a new string of 4 copies of the last 3 characters of a given original string.

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JavaScript: Tips of the Day

Converts a string to title case

Example:

const toTitleCase = str =>
  str
    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
    .map(x => x.charAt(0).toUpperCase() + x.slice(1))
    .join(' ');
console.log(toTitleCase('some_database_field_name')); // 'Some Database Field Name'
console.log(toTitleCase('Some label that needs to be title-cased')); // 'Some Label That Needs To Be Title Cased'
console.log(toTitleCase('some-package-name')); // 'Some Package Name'
console.log(toTitleCase('some-mixed_string with spaces_underscores-and-hyphens')); // 'Some Mixed String With Spaces Underscores And Hyphens' 

Output:

"Some Database Field Name"
"Some Label That Needs To Be Title Cased"
"Some Package Name"
"Some Mixed String With Spaces Underscores And Hyphens"