From 8045f8aae6f5823b9bbfe4adc958f4c8fe32c9d7 Mon Sep 17 00:00:00 2001
From: jero <aneurysmjs@outlook.com>
Date: Sun, 6 Oct 2019 23:09:48 +0300
Subject: [PATCH] refactor(utils): rename appendProps to pluckProps

apply correct typing

BREAKING CHANGE: appendProps is now renamed pluckProps
---
 src/app/shared/utils/pluckProps/index.tsx     |  1 +
 .../utils/pluckProps/pluckProps.test.tsx      | 52 +++++++++++++++++++
 .../shared/utils/pluckProps/pluckProps.tsx    | 17 ++++++
 3 files changed, 70 insertions(+)
 create mode 100644 src/app/shared/utils/pluckProps/index.tsx
 create mode 100644 src/app/shared/utils/pluckProps/pluckProps.test.tsx
 create mode 100644 src/app/shared/utils/pluckProps/pluckProps.tsx

diff --git a/src/app/shared/utils/pluckProps/index.tsx b/src/app/shared/utils/pluckProps/index.tsx
new file mode 100644
index 00000000..2c57bc9e
--- /dev/null
+++ b/src/app/shared/utils/pluckProps/index.tsx
@@ -0,0 +1 @@
+export { default } from './pluckProps';
diff --git a/src/app/shared/utils/pluckProps/pluckProps.test.tsx b/src/app/shared/utils/pluckProps/pluckProps.test.tsx
new file mode 100644
index 00000000..ef65bc21
--- /dev/null
+++ b/src/app/shared/utils/pluckProps/pluckProps.test.tsx
@@ -0,0 +1,52 @@
+import pluckProps from './pluckProps';
+
+type Obj = {
+  a: 1;
+  b: 2;
+};
+
+describe('pluckProps', () => {
+  it('should return a function', () => {
+    const fn = pluckProps<Obj>('a');
+    expect(typeof fn).toEqual('function');
+  });
+
+  it('should return an object with property "a" and ignore the rest', () => {
+    const fn = pluckProps<Obj>('a');
+    const obj = fn({ a: 1, b: 2 });
+    expect(obj).toEqual({ a: 1 });
+  });
+
+  it('should return an object with properties "a" and "b"', () => {
+    const fn = pluckProps<Obj>('a', 'b');
+    const obj = fn({ a: 1, b: 2 });
+    expect(obj).toEqual({ a: 1, b: 2 });
+  });
+
+  it('should return an object with property "b"', () => {
+    const fn = pluckProps<Obj>('b');
+    const obj = fn({ a: 1, b: 2 });
+    expect(obj).toEqual({ b: 2 });
+  });
+
+  // eslint-disable-next-line prettier/prettier
+  it('should return empty object if the given object doesn\'t match with properties to reflect', () => {
+    const fn = pluckProps<Obj>('a', 'b');
+    const obj = fn({ c: 3, d: 4 });
+    expect(obj).toEqual({});
+  });
+
+  // eslint-disable-next-line prettier/prettier
+  it('should return empty object if there\'s not properties to append', () => {
+    const fn = pluckProps<Obj>();
+    const obj = fn({ a: 1, b: 2 });
+    expect(obj).toEqual({});
+  });
+  // eslint-disable-next-line prettier/prettier
+  it('should throw if there\'s not object to reflect', () => {
+    const fn = pluckProps<Obj>('a', 'b');
+    expect(() => {
+      fn();
+    }).toThrow();
+  });
+});
diff --git a/src/app/shared/utils/pluckProps/pluckProps.tsx b/src/app/shared/utils/pluckProps/pluckProps.tsx
new file mode 100644
index 00000000..357aaf6a
--- /dev/null
+++ b/src/app/shared/utils/pluckProps/pluckProps.tsx
@@ -0,0 +1,17 @@
+/**
+ * @desc: conditionally append properties as they're defined
+ */
+
+type AppendProps = <T>(...args: Array<keyof T>) => (obj: T) => T | Partial<T>;
+
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+const pluckProps: AppendProps = (...args) => obj =>
+  args.reduce(
+    (acc, arg) => ({
+      ...acc,
+      ...(obj[arg] && { [arg]: obj[arg] }),
+    }),
+    {},
+  );
+
+export default pluckProps;