Add objectSize utility method

Calculates number of primitives in an object (leaf nodes)

Signed-off-by: Brian Evans <[email protected]>

lib-testing/test/common/ArrayUtils/ObjectSize.spec.ts

@@ -0,0 +1,41 @@
+import { objectSize } from '../../../../lib/common/ArrayUtils'
+import * as Assert from 'assert'
+
+describe('calculate the size of an object in number of primitives', function () {
+  it('should get the size of a simple object', function () {
+    const obj = {
+      action: 'delete',
+      date: new Date().getTime()
+    }
+    const output = objectSize(obj)
+    Assert.equal(output, 2)
+  })
+  it('should get the size of an object with 5 primitives', function () {
+    const obj = {
+      action: 'delete',
+      date: { year: 2020, month: 10 },
+      permission: true,
+      role: 'Admin'
+    }
+    const output = objectSize(obj)
+    Assert.equal(output, 5)
+  })
+  it('should get the size of an object with 6 primitives including null', function () {
+    const obj = {
+      action: 'delete',
+      date: { year: 2020, month: 10 },
+      permission: true,
+      role: 'Admin',
+      violation: null
+    }
+    const output = objectSize(obj)
+    Assert.equal(output, 6)
+  })
+  it('should get the size of an object with 6 primitives in an array', function () {
+    const obj = {
+      actions: ['create', 'delete', 'update', 'replace', 'rename', 'edit']
+    }
+    const output = objectSize(obj)
+    Assert.equal(output, 6)
+  })
+})

lib/common/ArrayUtils.ts

@@ -88,3 +88,16 @@ export const repeat = <T = any>(
 ): T[] => {
   return range(qty).map((v, i) => mapFn(i))
 }
+
+/**
+ * Returns the number of primitives in an object
+ */
+export const objectSize = (object: any) => {
+  if (typeof object !== 'object' || object === null) {
+    return 1
+  } else
+    return Object.values(object).reduce(
+      (total, current) => objectSize(current) + total,
+      0
+    )
+}