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Js "First-class" concept added (now in the correct time) #5

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Js "First-class" concept added (now in the correct time) #5

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6 changes: 6 additions & 0 deletions README.md
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Expand Up @@ -25,6 +25,12 @@
```javascript
console.log(typeof (typeof 'str')); // 'string'
```
- if you code:
```javascript
console.log(typeof(Object))
```
It returns "function" as result. This is because Javascript is a weakly typed language and with a great degree of freedom. JavaScript functions are called "high-order" or "first-class" and can, like objects, store attributes and methods.

- There is only one value in JavaScript that is not equal to itself - **NaN**. `NaN` is the result of a nonsensical computations and as such is not equal to another nonsensical computations.

- `null` and `undefined` are the equal in value but they have different types. They both represent the absence of any value.
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