Pascalcase string

JavaScript, String, Regexp · Sep 8, 2021

Converts a string to pascal 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(), String.prototype.toUpperCase() and String.prototype.toLowerCase() to combine them, capitalizing the first letter of each word and lowercasing the rest.

const toPascalCase = 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).toLowerCase())
    .join('');

toPascalCase('some_database_field_name'); // 'SomeDatabaseFieldName'
toPascalCase('Some label that needs to be pascalized');
// 'SomeLabelThatNeedsToBePascalized'
toPascalCase('some-javascript-property'); // 'SomeJavascriptProperty'
toPascalCase('some-mixed_string with spaces_underscores-and-hyphens');
// 'SomeMixedStringWithSpacesUnderscoresAndHyphens'