# Source: graph/basic.js

``````/**
* @overview Includes basic graph functions like creating a graph or cloning it.
*/

import cloneObj from 'lodash/fp/clone'
import curry from 'lodash/fp/curry'
import {create, isomorph as cIsomorph} from '../compound'
import {isomorphComponents} from './component'
import {setMetaKey} from './meta'
import {packageVersion} from '../internals'

/**
* Creates a new graph that has the exact same nodes and edges.
* @param {PortGraph} graph The graph to clone
* @returns {PortGraph} A clone of the input graph.
*/
export function clone (graph) {
return cloneObj(graph)
}

/**
* Compares two graphs for structural equality (i.e. tests if they are isomorph, where it is
* allowed to change the ids and paths of every node).
* @param {Portgraph} graph1 One of the graphs to compare.
* @param {Portgraph} graph2 The other the graph to compare.
* @returns {boolean} True if both graphs are structually equal, false otherwise.
*/
export const isomorph = curry((graph1, graph2) => {
return cIsomorph(graph1, graph2) && isomorphComponents(graph1, graph2)
})

/**
* Create a new compound node. Each compound node is itself a graph that can contain further nodes.
* @param {Node} node The node that should be converted into a compound node.
* @returns {PortGraph} The graph representing the compound node.
*/
export const compound = create

/**
* Returns a new empty graph.
* @returns {PortGraph} A new empty port graph.
*/
export function empty () {
return setMetaKey('version', packageVersion(), create())
}
``````