CODEWITHSUNDEEP
javascriptarraysobject
wahmal
wahmal

Reputation: 957

create list array from javascript tree object?

i have javascript tree object and i want to convert it to list array

My tree:

jsfiddle

how to get 'href' value and push it to an array list ?

var res=['hrefValue','hrefValue','hrefValue','hrefValue','hrefValue','hrefValue'];

Upvotes: 0

Views: 2531

Answers (3)

guest271314
guest271314

Reputation: 1

You can use Array.prototype.map(), spread element

let res = [];
tree.map(({href, nodes}) => res = [...res, href, ...nodes.map(({href:h}) => h)]);
// do stuff with `res`

jsfiddle https://jsfiddle.net/4ajr1spr/

Upvotes: 1

ibrahim mahrir
ibrahim mahrir

Reputation: 31712

function convert(tree){
    return tree.reduce(function(acc, o) {       // check the docs for reducs in the link bellow
        if(o.href)                              // if this object has an href
            acc.push(o.href);                   // add the href to the result array
        if(o.nodes)                             // if this object has children
            acc = acc.concat(convert(o.nodes)); // get their href and add (concat) them to the result
        return acc;
    }, []);
}

  • tree should be an array not a string, if you have it as a string (JSON string) then you have to parse it before passing it to the function using JSON.parse.

  • Javascript doesn't have ArrayLists, it only have arrays.

  • Here is the link to the docs of Array.prototype.reduce.

  • Here is a working fiddle.

Upvotes: 1

Matt Mokary
Matt Mokary

Reputation: 727

var getHrefs = function(nodes) {
    return nodes.reduce(function (arr, node) {
        return arr.concat(node.href).concat(node.nodes ? getHrefs(node.nodes) : []);
    }, []);
}

var hrefs = getHrefs(tree);   // ["7400.34.03.00.00.00", "7400.34.03.01.00.00", ... etc.]

Upvotes: 1

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