Usage

`javascript
var graphemeClusters2iterator = require( '@stdlib/string-to-grapheme-cluster-iterator' );
`

#### graphemeClusters2iterator( src\[, mapFcn\[, thisArg]] )

Returns an iterator which iterates over each [grapheme cluster][unicode-text-segmentation] in a string.

`javascript
var iter = graphemeClusters2iterator( '🌷🍕' );

var v = iter.next().value;
// returns '🌷'

v = iter.next().value;
// returns '🍕'

var bool = iter.next().done;
// returns true
`

The returned iterator protocol-compliant object has the following properties:

- next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
- return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.

To invoke a function for each src value, provide a callback function.

`javascript
function fcn( v ) {
return v + v;
}

var it = graphemeClusters2iterator( 'beep', fcn );
// returns