time-to-botec/js/node_modules/@stdlib/assert/instance-of/README.md

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# instanceOf

> Test whether a value has in its prototype chain a specified constructor as a prototype property.

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</section>

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<section class="usage">

## Usage

```javascript
var instanceOf = require( '@stdlib/assert/instance-of' );
```

#### instanceOf( value, constructor )

Tests whether a `value` has in its prototype chain a specified `constructor` as a `prototype` property.

```javascript
var inherit = require( '@stdlib/utils/inherit' );

function Foo() {
    return this;
}

function Bar() {
    return this;
}
inherit( Bar, Foo );

var bar = new Bar();

var bool = instanceOf( bar, Foo );
// returns true
```

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<section class="notes">

## Notes

-   The function throws a `TypeError` if provided a `constructor` argument which is not callable.

    ```javascript
    var bool = instanceOf( {}, null );
    // throws <TypeError>
    ```

-   While the prototype of an `object` created using object literal notion is `undefined`, the function returns `true` when provided an `object` literal and the `Object` constructor. This maintains consistent behavior with the `instanceof` operator.

    ```javascript
    var bool = ( {} instanceof Object );
    // returns true

    bool = instanceOf( {}, Object );
    // returns true
    ```

</section>

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<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var Number = require( '@stdlib/number/ctor' );
var instanceOf = require( '@stdlib/assert/instance-of' );

var bool = instanceOf( [], Array );
// returns true

bool = instanceOf( [], Object );
// returns true

bool = instanceOf( {}, Object );
// returns true

bool = instanceOf( new Date(), Date );
// returns true

bool = instanceOf( /.*/, RegExp );
// returns true

bool = instanceOf( instanceOf, Function );
// returns true

bool = instanceOf( null, Object );
// returns false

bool = instanceOf( 5, Number );
// returns false

bool = instanceOf( '5', String );
// returns false

bool = instanceOf( void 0, Object );
// returns false

bool = instanceOf( {}, Array );
// returns false

bool = instanceOf( {}, Function );
// returns false
```

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