feat(Modules): Add prop and propOr

__tests__/modules/prop.test.js

@@ -0,0 +1,19 @@
+import prop from '../../modules/prop'
+
+describe('prop', () => {
+  test('returns the value at the given key', () => {
+    const key = 'name'
+    const obj = { name: 'Tim' }
+    const result = prop(key, obj)
+
+    expect(result).toBe('Tim')
+  })
+
+  test('is curried', () => {
+    const key = 'name'
+    const obj = { name: 'Tim' }
+    const result = prop(key)(obj)
+
+    expect(result).toBe('Tim')
+  })
+})

__tests__/modules/propOr.test.js

@@ -0,0 +1,29 @@
+import propOr from '../../modules/propOr'
+
+describe('propOr', () => {
+  test('returns the value at the given key', () => {
+    const key = 'name'
+    const obj = { name: 'Tim' }
+    const result = propOr('', key, obj)
+
+    expect(result).toBe('Tim')
+  })
+
+  test('returns the default if key is undefined', () => {
+    const key = 'age'
+    const obj = { name: 'Tim' }
+    const def = 18
+    const result = propOr(def, key, obj)
+
+    expect(result).toBe(def)
+  })
+
+  test('is a curried function', () => {
+    const key = 'age'
+    const obj = { name: 'Tim' }
+    const def = 18
+    const result = propOr(def)(key)(obj)
+
+    expect(result).toBe(def)
+  })
+})

modules/prop.js

@@ -0,0 +1,5 @@
+import curry from './curry'
+
+const prop = curry((key, obj) => obj[key])
+
+export default prop

modules/propOr.js

@@ -0,0 +1,9 @@
+import curry from './curry'
+import prop from './prop'
+
+const propOr = curry((def, key, obj) => {
+  const val = prop(key, obj)
+  return val === undefined ? def : val
+})
+
+export default propOr