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JavaScript: Convert a string to kebab case

JavaScript fundamental (ES6 Syntax): Exercise-123 with Solution

Write a JavaScript program to convert a string to kebab case.

Note: Break the string into words and combine them adding - as a separator, using a regexp.

  • Use String.prototype.match() to break the string into words using an appropriate regexp.
  • Use Array.prototype.map(), Array.prototype.join() and String.prototype.toLowerCase() to combine them, adding - as a separator.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const toKebabCase = str =>
  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.toLowerCase())
    .join('-');

console.log(toKebabCase('camelCase'));
console.log(toKebabCase('some text'));
console.log(toKebabCase('some-mixed_string With spaces_underscores-and-hyphens'));
console.log(toKebabCase('AllThe-small Things'));
console.log(toKebabCase('IAmListeningToFMWhileLoadingDifferentURLOnMyBrowserAndAlsoEditingSomeXMLAndHTML'));

Sample Output:

camel-case
some-text
some-mixed-string-with-spaces-underscores-and-hyphens
all-the-small-things
i-am-listening-to-fm-while-loading-different-url-on-my-browser-and-also-editing-some-xml-and-html

Pictorial Presentation:

JavaScript Fundamental: Convert a string to kebab case.

Flowchart:

flowchart: Convert a string to kebab case

Live Demo:

See the Pen javascript-basic-exercise-123-1 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to add an ordinal suffix to a number.
Next: Write a JavaScript program to reduce a given Array-like into a value hash (keyed data store).

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JavaScript: Tips of the Day

How to remove a specific item from an array?

Find the index of the array element you want to remove using indexOf, and then remove that index with splice.

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

const array = [2, 5, 9];

console.log(array);

const index = array.indexOf(5);
if (index > -1) {
  array.splice(index, 1);
}

// array = [2, 9]
console.log(array);

The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.

For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5 from [2,5,9,1,5,8,5]), while the second function removes all occurrences:

function removeItemOnce(arr, value) {
  var index = arr.indexOf(value);
  if (index > -1) {
    arr.splice(index, 1);
  }
  return arr;
}

function removeItemAll(arr, value) {
  var i = 0;
  while (i < arr.length) {
    if (arr[i] === value) {
      arr.splice(i, 1);
    } else {
      ++i;
    }
  }
  return arr;
}
//Usage
console.log(removeItemOnce([2,5,9,1,5,8,5], 5))
console.log(removeItemAll([2,5,9,1,5,8,5], 5))

Ref: https://bit.ly/2N9nKRp