Question

119

Searching for items in a JSON array Using Node (preferably without iteration)

rated 0 times [ 120] [ 1] / answers: 1 / hits: 49265 / 12 Years ago, mon, august 6, 2012, 12:00:00

Currently I get back a JSON response like this...

{items:[

  {itemId:1,isRight:0},

  {itemId:2,isRight:1},

  {itemId:3,isRight:0}

]}

I want to perform something like this (pseudo code)

var arrayFound = obj.items.Find({isRight:1})

This would then return

[{itemId:2,isRight:1}]

I know I can do this with a for each loop, however, I am trying to avoid this. This is currently server side on a Node.JS app.

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kamronr

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answered 12 Years ago mckinleykeyshawnb · Accepted Answer

var arrayFound = obj.items.filter(function(item) {

    return item.isRight == 1;

});

Of course you could also write a function to find items by an object literal as a condition:

Array.prototype.myFind = function(obj) {

    return this.filter(function(item) {

        for (var prop in obj)

            if (!(prop in item) || obj[prop] !== item[prop])

                 return false;

        return true;

    });

};

// then use:

var arrayFound = obj.items.myFind({isRight:1});

Both functions make use of the native .filter() method on Arrays.