如何基于另一个键值将新的键值对添加到数组中的对象

Question

I have 2 JSON objects:

obj1 = [{
    "screenCode": "usr_ooo_master",
    "screenName": "Out Of Office Master"
    }, {
    "screenCode": "usr_user_master",
    "screenName": "User Master"
    }]

obj2 = [{
    "id": "10a310a8-6f01-4082-af86-bb73019cff8d",
    "cascadeImpact": {
        "screenCode": "usr_user_master",
        "impactedModuleCode": "borrower2"
    },
    "screenImpactedCode": "bor_address1"
}, {
    "id": "308c8058-5e98-4b99-a1c6-82e9e5c93787",
    "cascadeImpact": {
        "screenCode": "usr_ooo_master",
        "impactedModuleCode": "borrower2"
    },
    "screenImpactedCode": "bor_address2"
}]

I want to add a new key-value pair to obj2 depending on the "screenCode". So eg. I want to add "screenName": "User Master" to obj2 first element. How do I do that.

Answer 1

You could move the corresponding key/values pairs to a Map and update the object with the result of the map .

 var array1 = [{ screenCode: "usr_ooo_master", screenName: "Out Of Office Master" }, { screenCode: "usr_user_master", screenName: "User Master" }], array2 = [{ id: "10a310a8-6f01-4082-af86-bb73019cff8d", cascadeImpact: { screenCode: "usr_user_master", impactedModuleCode: "borrower2" }, screenImpactedCode: "bor_address1" }, { id: "308c8058-5e98-4b99-a1c6-82e9e5c93787", cascadeImpact: { screenCode: "usr_ooo_master", impactedModuleCode: "borrower2" }, screenImpactedCode: "bor_address2" }], map = new Map(array1.map(({ screenCode, screenName }) => [screenCode, screenName])); array2.forEach(({ cascadeImpact }) => cascadeImpact.screenName = map.get(cascadeImpact.screenCode)); console.log(array2); 

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Answer 2

obj2['screenName'] = 'User Master'

The only thing I a little but doubt is within obj2 you have single-element array. If the above won't work, you can always iterate on obj2 like (JQuery version):

$.each(obj2, function(index, element) {
   element['screenName'] = 'User Master';
}

Having in mind you olny have 1 element in the array - it will iterate only once (but the resource hunger will be larger than if you just do the assignment like in the first code)

Answer 3

if u want to add key to specific item just use key of that item: obj2[0]['screenName'] = "test" otherwise there is loop down below:

 obj2 = [{ "id": "10a310a8-6f01-4082-af86-bb73019cff8d", "cascadeImpact": { "screenCode": "usr_user_master", "impactedModuleCode": "borrower2" }, "screenImpactedCode": "bor_address1" }, { "id": "308c8058-5e98-4b99-a1c6-82e9e5c93787", "cascadeImpact": { "screenCode": "usr_ooo_master", "impactedModuleCode": "borrower2" }, "screenImpactedCode": "bor_address2" }] for(var i=0;i < obj2.length; i++){ obj2[i]['screenName'] = 'Master-' + (i+1); obj2[i]['screenCode'] = 'Code-' + (i+1); } console.log(obj2)