CODEWITHSUNDEEP
javascriptarrays
Catalin Vasilescu
Catalin Vasilescu

Reputation: 41

Accessing elements in javascript

I have this array:

 array = [{key: "6S", values: { 3: [{Id: "1234a"}, {Id: "1234b"}]}},

         {key: "7S", values: { 5: [{Id: "1534a"}], 4: [{Id:"1534a"}]}}]

I want to map "3", "5" and "4" (that are actually keys from another list inside the big list) from the values...something like this 

array.map(function(d)
        {  return d.values."key";}));

In order to access the values 3, 5 and 4 I can use a for loop. However, there is a way to access values directly?

Upvotes: 1

Views: 62

Answers (2)

Muhammad Usman
Muhammad Usman

Reputation: 10148

Object.keys gives you array and as a result in map, you get something like

[[3],[4,5]]

You can flatten the return array to single array like

array.join(',').split(',');


var array = [{
        key: "6S",
        values: {
            3: [{
                Id: "1234a"
            }, {
                Id: "1234b"
            }]
        }
    },

    {
        key: "7S",
        values: {
            5: [{
                Id: "1534a"
            }],
            4: [{
                Id: "1534a"
            }]
        }
    }
];

 var newArray = array.map(o=>  Object.keys(o.values))
 
 console.log(newArray.join(',').split(','))

Upvotes: 0

Barmar
Barmar

Reputation: 781003

Object.keys() will return an array of the keys of an object. Then you can use concat() to concatenate them.

array = [{key: "6S", values: { 3: [{Id: "1234a"}, {Id: "1234b"}]}},
         {key: "7S", values: { 5: [{Id: "1534a"}], 4: [{Id:"1534a"}]}}];
var result = [].concat(...array.map(d => Object.keys(d.values)));
console.log(result);

Upvotes: 2

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