> For the complete documentation index, see [llms.txt](https://dailyjournal.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dailyjournal.gitbook.io/notes/languages/javascript/built-in-objects.md).

# Built-in objects

## eval(string)

```javascript
let x = 1
let y = 1

console.log(eval('x+y+1'));        //3
```

## parseInt(string, radix)

```javascript
console.log(parseInt('10'))            //10
console.log(parseInt('F',16))          //15
console.log(parseInt('15', 10))        //15
console.log(parseInt('Hi', 10))        //NaN
```

## parseFloat(string)

```javascript
console.log(parseFloat('3.99'));        //3.99
console.log(parseFloat('3.99e-1'));     //0.399
console.log(parseFloat(''));            //NaN
```

## escape(string)

```javascript
console.log(escape('text'))        //text
console.log(escape(' '))           //%20
console.log(escape('abc&%'))       //abc%26%25
```

## unescape(string)

```
console.log(unescape('%20'))         //
console.log(unescape('abc%26%25'))   //abc&%
```