Add isomorphics/oneOf

src/isomorphics/index.ts

@@ -1,2 +1,3 @@
 export { default as entries } from './entries';
 export { default as isIterable } from './isIterable';
+export { default as oneOf } from './oneOf';

src/isomorphics/oneOf/index.ts

@@ -0,0 +1,17 @@
+/**
+ * Validate that the given data type exists as a primitive value in the given Array/Object/Enum shape
+ */
+const oneOf = (data: unknown, shape: Array<any> | Record<any, any>) => {
+  if (!shape || typeof shape !== 'object') {
+    throw new TypeError('You need to provide a shape to validate to oneOf');
+  }
+
+  if (Array.isArray(shape)) {
+    return shape.some(s => s === data);
+  }
+
+  // @ts-ignore
+  return Object.values(shape).some(s => s === data);
+};
+
+export default oneOf;

src/isomorphics/oneOf/oneOf.test.js

@@ -0,0 +1,20 @@
+import oneOf from '.';
+
+describe(`[Isomorphics]: oneOf`, () => {
+  it(`should return true if the given data occurs in the provided shape`, () => {
+    expect(oneOf(3, [1, 2, 3])).toBe(true);
+    expect(oneOf(`string`, [`string`, `s`, `[Object object]`])).toBe(true);
+  });
+
+  it(`should return false if the given data does not occur in the provided shape`, () => {
+    expect(oneOf(undefined, [1, 2, 3])).toBe(false);
+    expect(oneOf(null, [`string`, `s`, `[Object object]`])).toBe(false);
+    expect(oneOf(() => {}, [{}, `s`, `[Object object]`])).toBe(false);
+    expect(oneOf({}, [3, `s`, `[Object object]`])).toBe(false);
+  });
+
+  it(`should throw a TypeError if no shape is provided`, () => {
+    expect(() => oneOf(3)).toThrowError(TypeError);
+    expect(() => oneOf(3, function() {})).toThrowError(TypeError);
+  });
+});