strToConstantCase

Converts a string to CONSTANT_CASE: every word is uppercased and joined with an underscore.

The string is split with words, so spaces, punctuation, - and _ all act as delimiters, camelCase boundaries split, an acronym is separated from the word after it (XMLHttpRequest becomes XML_HTTP_REQUEST) and a run of digits is its own word (abc12def becomes ABC_12_DEF).

Scripts without upper and lower case keep their characters but still take part in the split, so 한글English혼합 becomes 한글_ENGLISH_혼합.

A letter that grows when uppercased

JavaScript and Python apply the full Unicode case mapping, where Dart applies the simple one. A handful of letters that expand into two characters therefore differ: straße becomes STRASSE in JavaScript and Python, but STRAßE in Dart. The same holds for ligatures such as fi. This is not papered over, because matching it would need a copy of the Unicode special-casing table in Dart.

This is the uppercase counterpart of strToSnakeCase.

Parameters

Name	Type	Required	Default
text	stringStringstr	●	–
The string to convert. An empty or missing value returns an empty string.

Returns

string

String

str

Examples

strToConstantCase('foo bar'); // Returns 'FOO_BAR'
strToConstantCase('--foo-bar--'); // Returns 'FOO_BAR'
strToConstantCase('camelCase'); // Returns 'CAMEL_CASE'
strToConstantCase('XMLHttpRequest'); // Returns 'XML_HTTP_REQUEST'
strToConstantCase('abc12def'); // Returns 'ABC_12_DEF'

strToConstantCase('foo bar'); // Returns 'FOO_BAR'
strToConstantCase('--foo-bar--'); // Returns 'FOO_BAR'
strToConstantCase('camelCase'); // Returns 'CAMEL_CASE'
strToConstantCase('XMLHttpRequest'); // Returns 'XML_HTTP_REQUEST'
strToConstantCase('abc12def'); // Returns 'ABC_12_DEF'

strToConstantCase('foo bar')  # Returns 'FOO_BAR'
strToConstantCase('--foo-bar--')  # Returns 'FOO_BAR'
strToConstantCase('camelCase')  # Returns 'CAMEL_CASE'
strToConstantCase('XMLHttpRequest')  # Returns 'XML_HTTP_REQUEST'
strToConstantCase('abc12def')  # Returns 'ABC_12_DEF'