英文:
Add nodes in a Graph not working perfectly in js
问题
我已经创建了一个包含键值对的图表，其中键是节点编号，值是邻接边的数组，这里我编写了一个函数，将节点和邻接边添加到图表中，但是这个函数在这里不起作用，我应该修改什么地方，以便获得类似这样的图表：{ 1:[2,4],2:[1,3],3:[2,4],4:[1,4],5:[3,4]}
给定的代码如下：
var graph = {
1: [2, 4],
2: [1, 3],
3: [2, 4],
4: [1, 4]
};
function addNode(key, value = []) {
graph[key] = value;
}
addNode(5, [3, 4]);
console.log(graph);
英文:
I have created a graph which containing key and value pair ,key is for node number and value for adjacency list value which is an array of adjacent edges, here I wrote a function that will add the node and adjacency edges in the graph, but here the function is not working ,which thing should I have to modified here that I want graph like { 1:[2,4],2:[1,3],3:[2,4],4:[1,4],5:[3,4]}
code is given below
var graph = {
1: [2, 4],
2: [1, 3],
3: [2, 4],
4: [1, 4]
};
function addNode(key, value = []) {
graph[key].push({ value: value });
}
addNode(5, [3, 4]);
console.log(graph);
答案1
得分: 1
function addNode(key, value = []) {
graph[key] = value;
}
或者，如果您要给已存在的节点添加新值：
function addNode(key, values = []) {
(graph[key] ??= []).push(...values);
}
试试看：
var graph = {
1: [2, 4],
2: [1, 3],
3: [2, 4],
4: [1, 4]
};
function addNode(key, value = []) {
graph[key] = value;
}
function addValuesToNode(key, value = []) {
(graph[key] ??= []).push(...value);
}
addNode(5, [3, 4]);
console.log(graph);
addValuesToNode(5, [1]);
console.log(graph);
英文:
function addNode(key, value = []) {
graph[key] = value;
}
Or, if you want to add new values to the node, given it already existed:
function addNode(key, values = []) {
(graph[key] ??= []).push(...values);
}
Try it:
<!-- begin snippet: js hide: true console: true babel: false -->
<!-- language: lang-js -->
var graph = {
1: [2, 4],
2: [1, 3],
3: [2, 4],
4: [1, 4]
};
function addNode(key, value = []) {
graph[key] = value;
}
function addValuesToNode(key, value = []) {
(graph[key] ??= []).push(...value);
}
addNode(5, [3, 4]);
console.log(graph);
addValuesToNode(5, [1]);
console.log(graph);
<!-- end snippet -->
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