Titlecase string

OSCC · 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'

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