Method setNodeValue

src/graph.js:101–113

(x, v)

		}

		setNodeValue (x, v) {
			const n = this.nodes[x];

			v = defined(v) ? v : null;

			if (n) {
				n.value = v;
			} else {
				this.nodes[x] = node(v);
			}

			return true;
		}

		toJSON (space = 0) {
			return JSON.stringify(this.nodes, null, space);