function get() {
	/* eslint-disable no-invalid-this */
	var scale = this.xScale;

	return xPos;
	/**
	* Maps a value to an `x` coordinate value.
	*
	* @private
	* @param {*} d - datum
	* @returns {number} pixel value
	*/
	function xPos( d ) {
		var px = scale( d );
		debug( 'Value: %d => Pixel: %d.', d, px );
		return px;
	}
}
Returns a function to map values to `x` coordinate values.

@private
@returns {Function} map function