Match value in array, that is inside an array of objects

Question

I have an array with objects that looks like this:

0:
depth:0
id:37
index:0
label:"user"
name:"r"
next:(3) [265, 355, 387]

I want to match an id with the values inside next: Array(3)

findNext = function(idToMatch) {
    const nodes = this.state.nodes;
    for (let i = 0; i < nodes.length; i++){
        if (nodes.next[i] === idToMatch) { return nodes[i].id }
    }
};

idToMatch is one integer, just like id:37 in above example.

const nodes = this.state.nodes; is the array that contains objects as the one above.

How can I check if this.state.nodes[i].next contains the idToMatch and, if so, return this.state.nodes[i].id?

Can you give a fuller description of the nodes? JSON format, perhaps? — CertainPerformance
– CertainPerformance, Commented May 14, 2018 at 8:49

devius · Accepted Answer · 2018-05-14 09:40:53Z

1

If you're ok with using ES2016's Array.prototype.includes();

findNext = function(idToMatch) {
    const nodes = this.state.nodes;
    let matches = [];

    for (let i = 0; i < nodes.length; i++) {
        if (nodes[i].next.includes(idToMatch)) matches.push(nodes[i].id);
    }

    return matches;
};

If not:

findNext = function(idToMatch) {
    const nodes = this.state.nodes;
    let matches = [];

    for (let i = 0; i < nodes.length; i++){
        if (nodes[i].next.indexOf(idToMatch) > -1) matches.push(nodes[i].id);
    }

    return matches;
};

edited May 14, 2018 at 9:40

answered May 14, 2018 at 8:54

devius

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2 Comments

Vialito Over a year ago

This works thanks! but if a node is connected to multiple other nodes, it doesn't return all the values. Would this be a good way to adjust the code? if (nodes[i].next.includes(idToMatch)) { arr.push(nodes[i].id) } and declare let arr = []; on top?

devius Over a year ago

Right, if there is the possibility for multiple nodes to match that is the correct way. I'll edit my answer to reflect that.

Muhammad Usman · Accepted Answer · 2018-05-14 08:52:57Z

0

You can use .find to get the matched object and then get any property of the object you want

this.state.nodes[i].next.find(o=> o === idToMatch)

answered May 14, 2018 at 8:52

Muhammad Usman

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Comments

Joel Harkes · Accepted Answer · 2018-05-14 08:54:13Z

0

just add another for loop inside the loop? like this:

const findNext = function(idToMatch) {
    const nodes = this.state.nodes;
    for (let i = 0; i < nodes.length; i++){
        for(let node in nodes.next){
           if(node.id == idToMatch){
             return node;
           } 
        }
        if (nodes.next[i] === idToMatch) { return nodes[i].id }
    }
};

answered May 14, 2018 at 8:54

Joel Harkes

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