# Function select

Wrap any value in a Selector, allowing to perform chained operations on
the value.

All methods available in the math.js library can be called upon the selector,
and then will be evaluated with the value itself as first argument.
The selector can be closed by executing `selector.done()`, which returns
the final value.

The Selector has a number of special functions:

- `done()`     Finalize the chained operation and return the selectors value.
- `valueOf()`  The same as `done()`
- `toString()` Executes `math.format()` onto the selectors value, returning
               a string representation of the value.


## Syntax

```js
math.select(value)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`value` | * | A value of any type on which to start a chained operation.

### Returns

Type | Description
---- | -----------
math.chaining.Selector | The created selector


## Examples

```js
var math = mathjs();

math.select(3)
    .add(4)
    .subtract(2)
    .done();     // 5

math.select( [[1, 2], [3, 4]] )
    .set([1, 1], 8)
    .multiply(3)
    .done();     // [[24, 6], [9, 12]]
```




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