在javascript中搜索字典数组中的id

Question

I have a array of dictionary in JavaScript and I want to add an element to one of the dictionary in the array by matching if an ID is found. How to search if an ID is found?

This is my dictionary:

{ 
    priyanka: [ { socketid: 'bVLmrV8I9JsSyON7AAAA' } ],
    test: [ { socketid: 'Q2n5RzcJqPeLZ5T9AAAB' } ] } ] 
}

I want to add an element by searching for socketid "bVLmrV8I9JsSyON7AAAA" and add an element to the dictionary.

Answer 1

In the current state of the data you'd have to use a linear search at least.

var keyToFind = 'Q2n5RzcJqPeLZ5T9AAAB';
for(var i in dictionary){
    if(dictionary[i].socketid == keyToFind){
        // Add an element to the dictionary
        break; // If you want to break out of the loop once you've found a match
    }
}

Answer 2

var myObject = { 
    priyanka: [ { socketid: 'bVLmrV8I9JsSyON7AAAA' } ],
    test: [ { socketid: 'Q2n5RzcJqPeLZ5T9AAAB' } ] } ] 
};

myObject.priyanka.forEach(function(item){
    if(item.socketid === 'bVLmrV8I9JsSyON7AAAA'){
        // There is a socketid equals to bVLmrV8I9JsSyON7AAAA in priyanka
        break;
    } else {
        // Socketid not found
    }
});

Be aware that Array.forEach is not fully cross browser compatible, maybe you want to go with a simple for loop :

for(var i=0; i < myObject.priyanka.length; i++){
    if(myObject.priyanka[i].socketid === 'bVLmrV8I9JsSyON7AAAA'){
        // There is a socketid equals to bVLmrV8I9JsSyON7AAAA in priyanka
        break;
    } else {
        // Socketid not found
    }
}

Answer 3

You're question is rather confusing but I think what you're trying to do is :

var myDict = { 
    priyanka: [ { socketid: 'bVLmrV8I9JsSyON7AAAA' } ],
    test    : [ { socketid: 'Q2n5RzcJqPeLZ5T9AAAB' } ],
 }

and then looping through the array (although in this case, they only contain one item...)

var arr = myDict.priyanka
for(var i=0; i<arr.length ; i++){
    if(arr[i].socketid === 'bVLmrV8I9JsSyON7AAAA'){
        var el = /whatever you wanna add?/
        arr.push(el);
       }
}

Answer 4

You can add elements like this

Dictionary

var dict = { 
priyanka: [ { socketid: 'bVLmrV8I9JsSyON7AAAA' } ],
test: [ { socketid: 'Q2n5RzcJqPeLZ5T9AAAB' } ] }

function

var addToDict = function (dict,id,element) {
    for(key in dict){   //search in each key of dictionary
       var obj = dict[key];
       if(obj[0].socketid == id)   // if that key contains socketId
         obj.push(element);    // add element to key's array
    }
}

call the function

addToDict(dict,'bVLmrV8I9JsSyON7AAAA',{"word":"meaning"}) 
console.log(dict)  // because object will be passed by reference the `dict` will changed.

Answer 5

You can use this helper function:

function findInDict(dict, predicate) 
{
    for (var prop in dict) {
        if (dict.hasOwnProperty(prop) && predicate(dict[prop], prop, dict)) {
            return prop;
        }
    }
    return null;
  };
}

Then perform the search:

// find property on main dictionary
var prop = findInDict(dict, function(value, name) {
    // name is property name
    // value is property value
    return value[0].socketid == 'bVLmrV8I9JsSyON7AAAA';
});

if (prop === null) {
    // prop doesn't exist, so create one?
}