feat: Support pascalcase (#364)

src/string/index.ts

@@ -4,3 +4,4 @@ export { kebabCase } from './kebabCase.ts';
 export { lowerCase } from './lowerCase.ts';
 export { startCase } from './startCase.ts';
 export { capitalize } from './capitalize.ts';
+export { pascalCase } from './pascalCase.ts';

src/string/pascalCase.spec.ts

@@ -0,0 +1,36 @@
+import { describe, expect, it } from 'vitest';
+import { pascalCase } from './pascalCase';
+
+describe('PascalCase', () => {
+  it('should change space to pascal case', () => {
+    expect(pascalCase('some whitespace')).toEqual('SomeWhitespace');
+  });
+
+  it('should change hyphen to pascal case', () => {
+    expect(pascalCase('hyphen-text')).toEqual('HyphenText');
+  });
+
+  it('should change Acronyms to small letter', () => {
+    expect(pascalCase('HTTPRequest')).toEqual('HttpRequest');
+  });
+
+  it('should handle leading and trailing whitespace', () => {
+    expect(pascalCase('    leading and trailing whitespace')).toEqual('LeadingAndTrailingWhitespace');
+  });
+
+  it('should handle special characters correctly', () => {
+    expect(pascalCase('special@characters!')).toEqual('SpecialCharacters');
+  });
+
+  it('should handle strings that are already in PascalCase', () => {
+    expect(pascalCase('PascalCase')).toEqual('PascalCase');
+  });
+
+  it('should work with an empty string', () => {
+    expect(pascalCase('')).toEqual('');
+  });
+
+  it('should work with screaming camel case', () => {
+    expect(pascalCase('FOO_BAR')).toEqual('FooBar');
+  });
+});

src/string/pascalCase.ts

@@ -0,0 +1,21 @@
+import { getWords } from './_internal/getWords';
+import { capitalize } from './capitalize';
+
+/**
+ * Converts a string to Pascal case.
+ *
+ * Pascal case is the naming convention in which each word is capitalized and concatenated without any separator characters.
+ *
+ * @param {string} str - The string that is to be changed to pascal case.
+ * @returns {string} - The converted string to Pascal case.
+ *
+ * @example
+ * const convertedStr1 = pascalCase('pascalCase') // returns 'PascalCase'
+ * const convertedStr2 = pascalCase('some whitespace') // returns 'SomeWhitespace'
+ * const convertedStr3 = pascalCase('hyphen-text') // returns 'HyphenText'
+ * const convertedStr4 = pascalCase('HTTPRequest') // returns 'HttpRequest'
+ */
+export const pascalCase = (str: string): string => {
+  const words = getWords(str);
+  return words.map(word => capitalize(word)).join('');
+};