implement string utilities lib

frontend/lib/strings/index.test.ts

@@ -0,0 +1,56 @@
+import { describe, it, expect } from "vitest";
+import { titlecase, capitalize, truncate } from ".";
+
+describe("title case tests", () => {
+  it("should return the same string if it's already title case", () => {
+    expect(titlecase("Hello World")).toBe("Hello World");
+  });
+
+  it("should title case a lower case word", () => {
+    expect(titlecase("hello")).toBe("Hello");
+  });
+
+  it("should title case a sentence", () => {
+    expect(titlecase("hello world")).toBe("Hello World");
+  });
+
+  it("should title case a sentence with multiple words", () => {
+    expect(titlecase("hello world this is a test")).toBe("Hello World This Is A Test");
+  });
+});
+
+describe("capitilize tests", () => {
+  it("should return the same string if it's already capitalized", () => {
+    expect(capitalize("Hello")).toBe("Hello");
+  });
+
+  it("should capitalize a lower case word", () => {
+    expect(capitalize("hello")).toBe("Hello");
+  });
+
+  it("should capitalize a sentence", () => {
+    expect(capitalize("hello world")).toBe("Hello world");
+  });
+
+  it("should capitalize a sentence with multiple words", () => {
+    expect(capitalize("hello world this is a test")).toBe("Hello world this is a test");
+  });
+});
+
+describe("truncase tests", () => {
+  it("should return the same string if it's already truncated", () => {
+    expect(truncate("Hello", 5)).toBe("Hello");
+  });
+
+  it("should truncate a lower case word", () => {
+    expect(truncate("hello", 3)).toBe("hel...");
+  });
+
+  it("should truncate a sentence", () => {
+    expect(truncate("hello world", 5)).toBe("hello...");
+  });
+
+  it("should truncate a sentence with multiple words", () => {
+    expect(truncate("hello world this is a test", 10)).toBe("hello worl...");
+  });
+});

frontend/lib/strings/index.ts

@@ -0,0 +1,14 @@
+export function titlecase(str: string) {
+  return str
+    .split(" ")
+    .map(word => word[0].toUpperCase() + word.slice(1))
+    .join(" ");
+}
+
+export function capitalize(str: string) {
+  return str[0].toUpperCase() + str.slice(1);
+}
+
+export function truncate(str: string, length: number) {
+  return str.length > length ? str.substring(0, length) + "..." : str;
+}