根据属性名称和类型对对象进行分组

Question

I have an array as per below;

var myArray = {
    "cartItems": {"paramA1": 25, "paramA2": 35},
    "cartShippingCost": {"paramB1": 4, "paramB2": 152, "paramB3": 536, "paramB4": 56},
    "cartNo": 675765,
    "cartSpecialRequirements": {"paramC1": 432},
    "cartPostage": {"paramD1": 56, "paramD2": 6537},
    "cartId": 54,
    "tel": 7778798548,
    "status": 5465465,
    "delivery": 65464646686674
};

var cartItems;

I perform a loop over myArray to find the objects who' key contains 'cart'

for (var key in myArray) {
    if (myArray.hasOwnProperty(key)) {
        if (key.indexOf('cart') > -1) {
            alert(key + " -> " + o[key]);
        }
    }
}

Which works great. I want to retrieve objects:

• with keys containing 'cart'
• and is of type structure, egfrom the above, cartNo and cartId are NOT of type structures.
• push the 'cart' structures type in to cartItems;

Answer 1

like this?

var data = {
    "cartItems": {"paramA1": 25, "paramA2": 35},
    "cartShippingCost": {"paramB1": 4, "paramB2": 152, "paramB3": 536, "paramB4": 56},
    "cartNo": 675765,
    "cartSpecialRequirements": {"paramC1": 432},
    "cartPostage": {"paramD1": 56, "paramD2": 6537},
    "cartId": 54,
    "tel": 7778798548,
    "status": 5465465,
    "delivery": 65464646686674
}

var cartObjects = [];
for(var k in data){
    var v = data[k];
    if(v && typeof v === "object" && k.indexOf("cart") !== -1 && data.hasOwnProperty(k)){
        cartObjects.push(v);
    }
}

console.log(cartObjects)

Answer 2

You can check if a variable is an object (structure as you said) by using typeof(var) . In your case, you could do something like this in your loop :

if (typeof(myArray[key]) == 'object')
{
    // do something
}

Hope it helps!

Answer 3

You just need to first filter your object for keys which contain 'cart' and they reference properties of type 'object'. Then map them to the referenced object. This will result in an array of objects.

var cartItems = Object.keys(myArray)
    .filter(key => {
        return key.indexOf('cart') > -1 && typeof myArray[key] === 'object';
    })
    .map(key => {
        return myArray[key];
    });

Answer 4

You may do it like this

 var myArray = { "cartItems": {"paramA1": 25, "paramA2": 35}, "cartShippingCost": {"paramB1": 4, "paramB2": 152, "paramB3": 536, "paramB4": 56}, "cartNo": 675765, "cartSpecialRequirements": {"paramC1": 432}, "cartPostage": {"paramD1": 56, "paramD2": 6537}, "cartId": 54, "tel": 7778798548, "status": 5465465, "delivery": 65464646686674 }; var result = Object.keys(myArray).reduce(function (p, c) { var value = myArray[c]; if (c === "cartItems" || c.indexOf("cart") < 0) { return p; } if (["string", "number", "boolean"].indexOf(typeof value) > -1) { p.push(value); } return p; }, []); document.write(JSON.stringify(result));