Titlecase string

JavaScript, String, Regexp · Oct 22, 2020

Converts a string to title case.

Use String.prototype.match() to break the string into words using an appropriate regexp.
Use Array.prototype.map(), Array.prototype.slice(), Array.prototype.join() and String.prototype.toUpperCase() to combine them, capitalizing the first letter of each word and adding a whitespace between them.

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(' ');

toTitleCase('some_database_field_name'); // 'Some Database Field Name'
toTitleCase('Some label that needs to be title-cased');
// 'Some Label That Needs To Be Title Cased'
toTitleCase('some-package-name'); // 'Some Package Name'
toTitleCase('some-mixed_string with spaces_underscores-and-hyphens');
// 'Some Mixed String With Spaces Underscores And Hyphens'