feat(gettag): adding util function to get to string tag of a value

src/getTag.test.ts

@@ -0,0 +1,16 @@
+import { getTag } from './getTag';
+
+describe('getTag', () => {
+  it('should get Number tag', () => {
+    expect(getTag(1)).toEqual('[object Number]');
+  });
+  it('should get String tag', () => {
+    expect(getTag('hello')).toEqual('[object String]');
+  });
+  it('should get Undefined tag', () => {
+    expect(getTag(undefined)).toEqual('[object Undefined]');
+  });
+  it('should get Null tag', () => {
+    expect(getTag(null)).toEqual('[object Null]');
+  });
+});

src/getTag.ts

@@ -0,0 +1,21 @@
+const toString = Object.prototype.toString;
+
+/**
+ * Gets the `toStringTag` of `value`.
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the `toStringTag`.
+ * @example
+ * ```javascript
+ * getTag(1)
+ * // => '[object Number]'
+ *
+ * getTag(null)
+ * // => '[object Null]'
+ * ```
+ */
+export function getTag(value: any): string {
+  return toString.call(value);
+}
+
+export default getTag;

src/memoize.ts

@@ -13,7 +13,7 @@ import { MemoizeInterface } from './types';
  * @param {Function} [resolver] The function to resolve the cache key.
  * @returns {Function} Returns the new memoized function.
  * @example
- *
+ * ```javascript
  * const object = { 'a': 1, 'b': 2 }
  * const other = { 'c': 3, 'd': 4 }
  *
@@ -32,6 +32,7 @@ import { MemoizeInterface } from './types';
  * values.cache.set(object, ['a', 'b'])
  * values(object)
  * // => ['a', 'b']
+ * ```
  */
 export function memoize(func: Function, resolver?: Function): MemoizeInterface {
   const memoized = function(...args: any): MemoizeInterface {

src/utils.ts

@@ -25,7 +25,8 @@ export function instanceOfActionBlock(object: object): object is ActionBlock {
  * @returns {boolean} Returns true if `object` has `principal` attribute.
  * @example
  * ```javascript
- * instanceOfPrincipalBlock({ principal: 'something' }) => true
+ * instanceOfPrincipalBlock({ principal: 'something' })
+ * // => true
  * ```
  */
 export function instanceOfPrincipalBlock(
@@ -40,7 +41,8 @@ export function instanceOfPrincipalBlock(
  * @returns {boolean} Returns true if `object` has `notResource` attribute.
  * @example
  * ```javascript
- * instanceOfNotResourceBlock({ notResource: 'something' }) => true
+ * instanceOfNotResourceBlock({ notResource: 'something' })
+ * // => true
  * ```
  */
 export function instanceOfNotResourceBlock(
@@ -55,7 +57,8 @@ export function instanceOfNotResourceBlock(
  * @returns {boolean} Returns true if `object` has `resource` attribute.
  * @example
  * ```javascript
- * instanceOfResourceBlock({ resource: 'something' }) => true
+ * instanceOfResourceBlock({ resource: 'something' })
+ * // => true
  * ```
  */
 export function instanceOfResourceBlock(