Added exercise on combining unions

total-typescript · Aug 15, 2023 · f40f234 · f40f234
1 parent 1d8ee85
commit f40f234
Show file tree

Hide file tree

Showing 35 changed files with 45 additions and 0 deletions.
diff --git a/src/038-unions-and-narrowing/039-combining-unions.problem.ts b/src/038-unions-and-narrowing/039-combining-unions.problem.ts
@@ -0,0 +1,21 @@
+type HttpCode = "400" | "401" | "404" | "500" | "200" | "201" | "204";
+
+const handleErrorCase = (code: string) => {
+  // An imaginary function where we only handle the errors
+
+  type test = Expect<Equal<typeof code, "400" | "401" | "404" | "500">>;
+};
+
+const handleSuccessCase = (code: string) => {
+  // An imaginary function where we only handle the success cases
+
+  type test = Expect<Equal<typeof code, "200" | "201" | "204">>;
+};
+
+const handleAllCase = (code: HttpCode) => {
+  // An imaginary function where we handle all the cases
+
+  type test = Expect<
+    Equal<typeof code, "200" | "201" | "204" | "400" | "401" | "404" | "500">
+  >;
+};
diff --git a/src/038-unions-and-narrowing/039-combining-unions.solution.ts b/src/038-unions-and-narrowing/039-combining-unions.solution.ts
@@ -0,0 +1,24 @@
+type SuccessCode = "200" | "201" | "204";
+type ErrorCode = "400" | "401" | "404" | "500";
+
+type HttpCode = SuccessCode | ErrorCode;
+
+const handleErrorCase = (code: ErrorCode) => {
+  // An imaginary function where we only handle the errors
+
+  type test = Expect<Equal<typeof code, "400" | "401" | "404" | "500">>;
+};
+
+const handleSuccessCase = (code: SuccessCode) => {
+  // An imaginary function where we only handle the success cases
+
+  type test = Expect<Equal<typeof code, "200" | "201" | "204">>;
+};
+
+const handleAllCase = (code: HttpCode) => {
+  // An imaginary function where we handle all the cases
+
+  type test = Expect<
+    Equal<typeof code, "200" | "201" | "204" | "400" | "401" | "404" | "500">
+  >;
+};
diff --git a/...g/039-how-big-can-a-union-be.explainer.ts → ...g/040-how-big-can-a-union-be.explainer.ts b/...g/039-how-big-can-a-union-be.explainer.ts → ...g/040-how-big-can-a-union-be.explainer.ts
diff --git a/.../040-literals-vs-wider-types.explainer.ts → .../041-literals-vs-wider-types.explainer.ts b/.../040-literals-vs-wider-types.explainer.ts → .../041-literals-vs-wider-types.explainer.ts
diff --git a/...narrowing-unions-with-typeof.explainer.ts → ...narrowing-unions-with-typeof.explainer.ts b/...narrowing-unions-with-typeof.explainer.ts → ...narrowing-unions-with-typeof.explainer.ts
diff --git a/...2-narrowing-with-if-statements.problem.ts → ...3-narrowing-with-if-statements.problem.ts b/...2-narrowing-with-if-statements.problem.ts → ...3-narrowing-with-if-statements.problem.ts
diff --git a/...arrowing-with-if-statements.solution.1.ts → ...arrowing-with-if-statements.solution.1.ts b/...arrowing-with-if-statements.solution.1.ts → ...arrowing-with-if-statements.solution.1.ts
diff --git a/...arrowing-with-if-statements.solution.2.ts → ...arrowing-with-if-statements.solution.2.ts b/...arrowing-with-if-statements.solution.2.ts → ...arrowing-with-if-statements.solution.2.ts
diff --git a/...arrowing-with-if-statements.solution.3.ts → ...arrowing-with-if-statements.solution.3.ts b/...arrowing-with-if-statements.solution.3.ts → ...arrowing-with-if-statements.solution.3.ts
diff --git a/...arrowing-with-if-statements.solution.4.ts → ...arrowing-with-if-statements.solution.4.ts b/...arrowing-with-if-statements.solution.4.ts → ...arrowing-with-if-statements.solution.4.ts
diff --git a/...arrowing-with-if-statements.solution.5.ts → ...arrowing-with-if-statements.solution.5.ts b/...arrowing-with-if-statements.solution.5.ts → ...arrowing-with-if-statements.solution.5.ts
diff --git a/...owing-with-boolean-wont-work.explainer.ts → ...owing-with-boolean-wont-work.explainer.ts b/...owing-with-boolean-wont-work.explainer.ts → ...owing-with-boolean-wont-work.explainer.ts
diff --git a/.../044-throwing-errors-to-narrow.problem.ts → .../045-throwing-errors-to-narrow.problem.ts b/.../044-throwing-errors-to-narrow.problem.ts → .../045-throwing-errors-to-narrow.problem.ts
diff --git a/...044-throwing-errors-to-narrow.solution.ts → ...045-throwing-errors-to-narrow.solution.ts b/...044-throwing-errors-to-narrow.solution.ts → ...045-throwing-errors-to-narrow.solution.ts
diff --git a/...ing-with-instanceof-statements.problem.ts → ...ing-with-instanceof-statements.problem.ts b/...ing-with-instanceof-statements.problem.ts → ...ing-with-instanceof-statements.problem.ts
diff --git a/...ng-with-instanceof-statements.solution.ts → ...ng-with-instanceof-statements.solution.ts b/...ng-with-instanceof-statements.solution.ts → ...ng-with-instanceof-statements.solution.ts
diff --git a/...6-narrowing-with-in-statements.problem.ts → ...7-narrowing-with-in-statements.problem.ts b/...6-narrowing-with-in-statements.problem.ts → ...7-narrowing-with-in-statements.problem.ts
diff --git a/...-narrowing-with-in-statements.solution.ts → ...-narrowing-with-in-statements.solution.ts b/...-narrowing-with-in-statements.solution.ts → ...-narrowing-with-in-statements.solution.ts
diff --git a/...7-narrowing-unknown-to-a-value.problem.ts → ...8-narrowing-unknown-to-a-value.problem.ts b/...7-narrowing-unknown-to-a-value.problem.ts → ...8-narrowing-unknown-to-a-value.problem.ts
diff --git a/...-narrowing-unknown-to-a-value.solution.ts → ...-narrowing-unknown-to-a-value.solution.ts b/...-narrowing-unknown-to-a-value.solution.ts → ...-narrowing-unknown-to-a-value.solution.ts
diff --git a/...g/048-narrowing-with-ternaries.problem.ts → ...g/049-narrowing-with-ternaries.problem.ts b/...g/048-narrowing-with-ternaries.problem.ts → ...g/049-narrowing-with-ternaries.problem.ts
diff --git a/.../048-narrowing-with-ternaries.solution.ts → .../049-narrowing-with-ternaries.solution.ts b/.../048-narrowing-with-ternaries.solution.ts → .../049-narrowing-with-ternaries.solution.ts
diff --git a/...rowing-with-nullish-coalescing.problem.ts → ...rowing-with-nullish-coalescing.problem.ts b/...rowing-with-nullish-coalescing.problem.ts → ...rowing-with-nullish-coalescing.problem.ts
diff --git a/...owing-with-nullish-coalescing.solution.ts → ...owing-with-nullish-coalescing.solution.ts b/...owing-with-nullish-coalescing.solution.ts → ...owing-with-nullish-coalescing.solution.ts
diff --git a/...-intro-to-discriminated-unions.problem.ts → ...-intro-to-discriminated-unions.problem.ts b/...-intro-to-discriminated-unions.problem.ts → ...-intro-to-discriminated-unions.problem.ts
diff --git a/...intro-to-discriminated-unions.solution.ts → ...intro-to-discriminated-unions.solution.ts b/...intro-to-discriminated-unions.solution.ts → ...intro-to-discriminated-unions.solution.ts
diff --git a/...ucturing-a-discriminated-union.problem.ts → ...ucturing-a-discriminated-union.problem.ts b/...ucturing-a-discriminated-union.problem.ts → ...ucturing-a-discriminated-union.problem.ts
diff --git a/...cturing-a-discriminated-union.solution.ts → ...cturing-a-discriminated-union.solution.ts b/...cturing-a-discriminated-union.solution.ts → ...cturing-a-discriminated-union.solution.ts
diff --git a/...-union-with-a-switch-statement.problem.ts → ...-union-with-a-switch-statement.problem.ts b/...-union-with-a-switch-statement.problem.ts → ...-union-with-a-switch-statement.problem.ts
diff --git a/...union-with-a-switch-statement.solution.ts → ...union-with-a-switch-statement.solution.ts b/...union-with-a-switch-statement.solution.ts → ...union-with-a-switch-statement.solution.ts
diff --git a/...3-narrowing-with-switch-true.explainer.ts → ...4-narrowing-with-switch-true.explainer.ts b/...3-narrowing-with-switch-true.explainer.ts → ...4-narrowing-with-switch-true.explainer.ts
diff --git a/...ucturing-a-discriminated-tuple.problem.ts → ...ucturing-a-discriminated-tuple.problem.ts b/...ucturing-a-discriminated-tuple.problem.ts → ...ucturing-a-discriminated-tuple.problem.ts
diff --git a/...cturing-a-discriminated-tuple.solution.ts → ...cturing-a-discriminated-tuple.solution.ts b/...cturing-a-discriminated-tuple.solution.ts → ...cturing-a-discriminated-tuple.solution.ts
diff --git a/...ing/055-discriminated-booleans.problem.ts → ...ing/056-discriminated-booleans.problem.ts b/...ing/055-discriminated-booleans.problem.ts → ...ing/056-discriminated-booleans.problem.ts
diff --git a/...ng/055-discriminated-booleans.solution.ts → ...ng/056-discriminated-booleans.solution.ts b/...ng/055-discriminated-booleans.solution.ts → ...ng/056-discriminated-booleans.solution.ts