# JavaScript types

A quiz about JavaScript types and their conversion.

Select the correct evaluation result

|                | `true` | `false` |
| -------------- | ------ | ------- |
| `0 == false`   | \[x]   | \[ ]    |
| `0 === false`  | \[ ]   | \[x]    |
| `1 == true`    | \[x]   | \[ ]    |
| `'1' == false` | \[ ]   | \[x]    |

> Get it right!

Choose the returned value for each `typeof` operator use cases. For example the first one would be executed as `typeof "Hello"` and would return a `"string"`.

| `typeof` ... | `"object"` | `"number"` | `"array"` | `"string"` | `"function"` | `"undefined"` | `"boolean"` |
| ------------ | ---------- | ---------- | --------- | ---------- | ------------ | ------------- | ----------- |
| `"Hello"`    | \[ ]       | \[ ]       | \[ ]      | \[x]       | \[ ]         | \[ ]          | \[ ]        |
| `true`       | \[ ]       | \[ ]       | \[ ]      | \[ ]       | \[ ]         | \[ ]          | \[x]        |
| `108`        | \[ ]       | \[x]       | \[ ]      | \[ ]       | \[ ]         | \[ ]          | \[ ]        |
| `[0, 1, 2]`  | \[x]       | \[ ]       | \[ ]      | \[ ]       | \[ ]         | \[ ]          | \[ ]        |
| `{}`         | \[x]       | \[ ]       | \[ ]      | \[ ]       | \[ ]         | \[ ]          | \[ ]        |
| `new Date()` | \[x]       | \[ ]       | \[ ]      | \[ ]       | \[ ]         | \[ ]          | \[ ]        |
| `undefined`  | \[ ]       | \[ ]       | \[ ]      | \[ ]       | \[ ]         | \[x]          | \[ ]        |
| `"true"`     | \[ ]       | \[ ]       | \[ ]      | \[x]       | \[ ]         | \[ ]          | \[ ]        |
| `12.8`       | \[ ]       | \[x]       | \[ ]      | \[ ]       | \[ ]         | \[ ]          | \[ ]        |
| `alert`      | \[ ]       | \[ ]       | \[ ]      | \[ ]       | \[x]         | \[ ]          | \[ ]        |

> How about trying it in the console of your browser?

What are the output values of the following expressions?

`1 + 2`

* [ ] `12`
* [x] `3`

`"1" + 2`

* [ ] `12`
* [x] `"12"`
* [ ] `3`
* [ ] `"3"`

`+"1" + 2`

* [ ] `12`
* [ ] `"12"`
* [x] `3`
* [ ] `"3"`

`1 + "2"`

* [ ] `12`
* [x] `"12"`
* [ ] `3`
* [ ] `"3"`

`1+ +"2"`

* [ ] `12`
* [ ] `"12"`
* [x] `3`
* [ ] `"3"`

> String always wins! ...unless it is turned to a number first.