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# Fibonacci Number

> Maximum safe nth [Fibonacci number][fibonacci-number] when stored in [double-precision floating-point][ieee754] format.

<section class="usage">

## Usage

<!-- eslint-disable id-length -->

```javascript
var FLOAT64_MAX_SAFE_NTH_FIBONACCI = require( '@stdlib/constants/float64/max-safe-nth-fibonacci' );
```

#### FLOAT64_MAX_SAFE_NTH_FIBONACCI

The maximum [safe][safe-integers] nth [Fibonacci number][fibonacci-number] when stored in [double-precision floating-point][ieee754] format.

<!-- eslint-disable id-length -->

```javascript
var bool = ( FLOAT64_MAX_SAFE_NTH_FIBONACCI === 78 );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable id-length -->

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

```javascript
var FLOAT64_MAX_SAFE_NTH_FIBONACCI = require( '@stdlib/constants/float64/max-safe-nth-fibonacci' );

var v;
var i;

function fibonacci( n ) {
    var a;
    var b;
    var c;
    var i;

    a = 1;
    b = 1;
    for ( i = 3; i <= n; i++ ) {
        c = a + b;
        a = b;
        b = c;
    }
    return b;
}

for ( i = 0; i < 100; i++ ) {
    v = fibonacci( i );
    if ( i > FLOAT64_MAX_SAFE_NTH_FIBONACCI ) {
        console.log( 'Unsafe: %d', v );
    } else {
        console.log( 'Safe:   %d', v );
    }
}
```

</section>

<!-- /.examples -->

<section class="links">

[safe-integers]: http://www.2ality.com/2013/10/safe-integers.html

[fibonacci-number]: https://en.wikipedia.org/wiki/Fibonacci_number

[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985

</section>

<!-- /.links -->
