feat: add strings helpers

Author: JDIZM

src/helpers/strings.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from "vitest";
+
+import { camelCase, capitalize, pascalCase, titleCase } from "./strings.js";
+
+describe("camelCase", () => {
+  it("should convert a string to camelCase", () => {
+    expect(camelCase("this is a string")).toBe("thisIsAString");
+  });
+});
+
+describe("capitalize", () => {
+  it("should capitalize the first letter of a string", () => {
+    expect(capitalize("this is a string")).toBe("This is a string");
+  });
+});
+
+describe("pascalCase", () => {
+  it("should convert a string to PascalCase", () => {
+    expect(pascalCase("this is a string")).toBe("ThisIsAString");
+  });
+});
+
+describe("titleCase", () => {
+  it("should convert a string to Title Case", () => {
+    expect(titleCase("this is a string")).toBe("This Is A String");
+  });
+});

src/helpers/strings.ts

@@ -0,0 +1,26 @@
+export const camelCase = (str: string): string => {
+  return str
+    .split(" ")
+    .map((word, index) => {
+      if (index === 0) {
+        return word.toLowerCase();
+      }
+      return word.charAt(0).toUpperCase() + word.slice(1);
+    })
+    .join("");
+};
+
+export const capitalize = (str: string): string => {
+  return str.charAt(0).toUpperCase() + str.slice(1);
+};
+
+export const pascalCase = (str: string): string => {
+  return capitalize(camelCase(str));
+};
+
+export const titleCase = (str: string): string => {
+  return str
+    .split(" ")
+    .map((word) => capitalize(word))
+    .join(" ");
+};