2023-09-13T15:25:30.037Z

total-typescript · Sep 13, 2023 · a2a192b · a2a192b
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diff --git a/src/075-designing-your-types/179-intro-to-helper-types.problem.ts b/src/075-designing-your-types/179-intro-to-helper-types.problem.ts
@@ -0,0 +1,62 @@
+type ErrorShape = {
+  error: {
+    message: string;
+  };
+};
+
+type UserDataShape =
+  | {
+      data: {
+        id: string;
+        name: string;
+        email: string;
+      };
+    }
+  | ErrorShape;
+
+type PostDataShape =
+  | {
+      data: {
+        id: string;
+        title: string;
+        body: string;
+      };
+    }
+  | ErrorShape;
+
+type tests = [
+  Expect<
+    Equal<
+      UserDataShape,
+      | {
+          data: {
+            id: string;
+            name: string;
+            email: string;
+          };
+        }
+      | {
+          error: {
+            message: string;
+          };
+        }
+    >
+  >,
+  Expect<
+    Equal<
+      PostDataShape,
+      | {
+          data: {
+            id: string;
+            title: string;
+            body: string;
+          };
+        }
+      | {
+          error: {
+            message: string;
+          };
+        }
+    >
+  >,
+];
diff --git a/src/075-designing-your-types/179-intro-to-helper-types.solution.ts b/src/075-designing-your-types/179-intro-to-helper-types.solution.ts
@@ -0,0 +1,60 @@
+type ErrorShape = {
+  error: {
+    message: string;
+  };
+};
+
+type DataShape<T> =
+  | {
+      data: T;
+    }
+  | ErrorShape;
+
+type UserDataShape = DataShape<{
+  id: string;
+  name: string;
+  email: string;
+}>;
+
+type PostDataShape = DataShape<{
+  id: string;
+  title: string;
+  body: string;
+}>;
+
+type tests = [
+  Expect<
+    Equal<
+      UserDataShape,
+      | {
+          data: {
+            id: string;
+            name: string;
+            email: string;
+          };
+        }
+      | {
+          error: {
+            message: string;
+          };
+        }
+    >
+  >,
+  Expect<
+    Equal<
+      PostDataShape,
+      | {
+          data: {
+            id: string;
+            title: string;
+            body: string;
+          };
+        }
+      | {
+          error: {
+            message: string;
+          };
+        }
+    >
+  >,
+];
diff --git a/...ing-your-types/180-result-type.problem.ts → ...s/180-multiple-type-parameters.problem.ts b/...ing-your-types/180-result-type.problem.ts → ...s/180-multiple-type-parameters.problem.ts
diff --git a/...ng-your-types/180-result-type.solution.ts → .../180-multiple-type-parameters.solution.ts b/...ng-your-types/180-result-type.solution.ts → .../180-multiple-type-parameters.solution.ts
diff --git a/src/075-designing-your-types/181-multiple-type-parameters.problem.ts b/src/075-designing-your-types/181-multiple-type-parameters.problem.ts
diff --git a/src/075-designing-your-types/181-multiple-type-parameters.solution.ts b/src/075-designing-your-types/181-multiple-type-parameters.solution.ts
diff --git a/src/075-designing-your-types/181-result-type.explainer.ts b/src/075-designing-your-types/181-result-type.explainer.ts
@@ -0,0 +1,37 @@
+type Result<TResult, TError> =
+  | {
+      success: true;
+      data: TResult;
+    }
+  | {
+      success: false;
+      error: TError;
+    };
+
+const createRandomNumber = (): Result<number, Error> => {
+  const num = Math.random();
+
+  if (num > 0.5) {
+    return {
+      success: true,
+      data: 123,
+    };
+  }
+
+  return {
+    success: false,
+    error: new Error("Something went wrong"),
+  };
+};
+
+const result = createRandomNumber();
+
+if (result.success) {
+  console.log(result.data);
+
+  type test = Expect<Equal<typeof result.data, number>>;
+} else {
+  console.error(result.error);
+
+  type test = Expect<Equal<typeof result.error, Error>>;
+}
diff --git a/src/075-designing-your-types/182-default-type-parameters.problem.ts b/src/075-designing-your-types/182-default-type-parameters.problem.ts
@@ -0,0 +1,37 @@
+type Result<TResult, TError> =
+  | {
+      success: true;
+      data: TResult;
+    }
+  | {
+      success: false;
+      error: TError;
+    };
+
+const createRandomNumber = (): Result<number> => {
+  const num = Math.random();
+
+  if (num > 0.5) {
+    return {
+      success: true,
+      data: 123,
+    };
+  }
+
+  return {
+    success: false,
+    error: new Error("Something went wrong"),
+  };
+};
+
+const result = createRandomNumber();
+
+if (result.success) {
+  console.log(result.data);
+
+  type test = Expect<Equal<typeof result.data, number>>;
+} else {
+  console.error(result.error);
+
+  type test = Expect<Equal<typeof result.error, Error>>;
+}
diff --git a/src/075-designing-your-types/182-default-type-parameters.solution.ts b/src/075-designing-your-types/182-default-type-parameters.solution.ts
@@ -0,0 +1,37 @@
+type Result<TResult, TError = Error> =
+  | {
+      success: true;
+      data: TResult;
+    }
+  | {
+      success: false;
+      error: TError;
+    };
+
+const createRandomNumber = (): Result<number> => {
+  const num = Math.random();
+
+  if (num > 0.5) {
+    return {
+      success: true,
+      data: 123,
+    };
+  }
+
+  return {
+    success: false,
+    error: new Error("Something went wrong"),
+  };
+};
+
+const result = createRandomNumber();
+
+if (result.success) {
+  console.log(result.data);
+
+  type test = Expect<Equal<typeof result.data, number>>;
+} else {
+  console.error(result.error);
+
+  type test = Expect<Equal<typeof result.error, Error>>;
+}