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Convert the given string to a lowercase sentence with words joined by dashes.

• String global object
• JS Regex Resources
• JS String Prototype Replace
• JS String Prototype ToLowerCase

Create a regular expression for all white spaces and underscores.

try to solve the problem now

You will also have to make everything lowercase.

try to solve the problem now

The tricky part is getting the regular expression part to work, once you do that then just turn the uppercase to lowercase and replace spaces with underscores using replace().

try to solve the problem now

Solution ahead!

function spinalCase(str) {
  // Create a variable for the white space and underscores.
  var regex = /\s+|_+/g;

  // Replace low-upper case to low-space-uppercase
  str = str.replace(/([a-z])([A-Z])/g, '$1 $2');

  // Replace space and underscore with -
  return str.replace(regex, '-').toLowerCase();
}

// test here
spinalCase('This Is Spinal Tap');

🚀 Run Code

• regex contains the regular expression /\s+|_+/g, which will select all white spaces and underscores.
• The first replace() puts a space before any encountered uppercase characters in the string str so that the spaces can be replaced by dashes later on.
• While returning the string, another replace() replaces spaces and underscores with dashes using regex.

function spinalCase(str) {
  // Replace low-upper case to low-space-uppercase
  str = str.replace(/([a-z])([A-Z])/g, '$1 $2');
  // Split on whitespace and underscores and join with dash
  return str.toLowerCase().split(/(?:_| )+/) .join('-');
}

// test here
spinalCase('This Is Spinal Tap');

🚀 Run Code

• Similar to the first solution, the first replace() puts a space before any encountered uppercase characters in the string str so that the spaces can be replaced by dashes later on.
• Instead of using replace() here to replace whitespace and underscores with dashes, the string is split() on the regular expression /(?:_| )+/ and join()-ed on -.

• JS String Prototype Split
• JS Array Prototype Join

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