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diff --git a/src/calculator.ts b/src/calculator.ts
new file mode 100644
index 0000000..fedcba0
--- /dev/null
+++ b/src/calculator.ts
@@ -0,0 +1,40 @@
+export class Calculator {
+ // Function coverage
+ add(a: number, b: number): number {
+ return a + b;
+ }
+
+ // Branch coverage
+ divide(a: number, b: number): number {
+ if (b === 0) {
+ throw new Error("Division by zero");
+ }
+ return a / b;
+ }
+
+ // Anonymous function coverage
+ processNumbers(
+ numbers: number[],
+ processor: (n: number) => number = (n) => n * 2
+ ): number[] {
+ return numbers.map(processor);
+ }
+
+ // Line and branch coverage
+ getGrade(score: number): string {
+ if (score < 0 || score > 100) {
+ throw new Error("Invalid score");
+ }
+
+ if (score >= 90) {
+ return "A";
+ } else if (score >= 80) {
+ return "B";
+ } else if (score >= 70) {
+ return "C";
+ } else {
+ return "F";
+ }
+ }
+}
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