isEmpty logic and tests not coinciding

isEmpty logic and tests not coinciding

I tried to use isEmpty() and received some illogical results. So a dig a little deeper and found some incorrect logic and tests.

Below is my code to just print to the console some common scenario using isEmpt():

```
import { isEmpty } from 'radash'

console.log(`\n🟠====== typed | isEmpty() ========`)
// console.log(`\n🔷 Comparing radash isEmpty() to fxts isEmpty()`)

console.log(`\n🔷 Number`)
console.log(`✅ isEmpty(1)`, isEmpty(1)) // false
console.log(`✅ isEmpty(0)`, isEmpty(0)) // false

console.log(`\n🔷 Boolean`)
console.log(`✅ isEmpty(false)`, isEmpty(false)) // false
console.log(`✅ isEmpty(true)`, isEmpty(true)) // false

console.log(`\n🔷 Date`)
console.log(`✅ isEmpty(new Date())`, isEmpty(new Date())) // false

console.log(`\n🔷 Null and Undefined`)
console.log(`✅ isEmpty(undefined)`, isEmpty(undefined)) // true
console.log(`✅ isEmpty(null)`, isEmpty(null)) // true

console.log(`\n🔷 Object`)
console.log(`✅ isEmpty({})`, isEmpty({})) // true
console.log(`✅ isEmpty({a:1})`, isEmpty({ a: 1 })) // false

console.log(`\n🔷 Array`)
console.log(`✅ isEmpty([])`, isEmpty([])) // true
console.log(`✅ isEmpty([1])`, isEmpty([1])) // false

console.log(`\n🔷 String/Char`)
console.log(`✅ isEmpty("")`, isEmpty('')) // true
console.log(`✅ isEmpty("a")`, isEmpty('a')) // false

console.log(`\n🔷 Function`)
console.log(
  `✅ isEmpty(function(){})`,
  isEmpty(function () {})
) // false

console.log(`\n🔷 Symbol`)
console.log(`✅ isEmpty(Symbol(""))`, isEmpty(Symbol(''))) // false
```

... and below is the result:

![image](https://user-images.githubusercontent.com/3227590/187710211-a234878b-0c39-4072-95d7-70aefaf08a6f.png)

As you can see, my expectations as indicated by the // comments in the console statements do differ from yours significantly.

I looked at your tests and it seems the test would suggest what I received. For instance, take your tests from your test suite for the first two console statements above:

```
    test('returns true for number greater than 0', () => {
      const input = 22
      const result = _.isEmpty(input)
      assert.isTrue(result)
    })
    test('returns true for number 0', () => {
      const input = 0
      const result = _.isEmpty(input)
      assert.isTrue(result)
    })

```

The logic is suggesting that both digits test return true. Is it an error?

Another example pertaining to arrays...

console.log(`\n🔷 Array`)
console.log(`✅ isEmpty([])`, isEmpty([])) // true
console.log(`✅ isEmpty([1])`, isEmpty([1])) // false

🔷 Array
✅ isEmpty([]) true
✅ isEmpty([1]) true

```
      const input = [1, 2, 3]
      const result = _.isEmpty(input)
      assert.isFalse(result)
    })
    test('returns true for empty array', () => {
      const input = []
      const result = _.isEmpty(input)
      assert.isTrue(result)
    })
```

Again the test for isEmpty(array) is not in keeping with what I am expecting or the test assertion - an array with no elements returns true  and an array with elements returns false (as your test) and what I expect. But, as you see above true is being returned by both.

Cheers