Accessing elements in javascript

Question

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?

what do you mean by I want to map "3", "5" and "4" ? do you want a separate array/object for them ? — Muhammad Usman
– Muhammad Usman, Commented May 10, 2018 at 15:15
@GeorgeBailey to create a list with this 3 elements... I want to use this elements as domain of the axis. Object.keys(d.values) return only the elements from the last object of the list. — Catalin Vasilescu
– Catalin Vasilescu, Commented May 10, 2018 at 15:22

Barmar · Accepted Answer · 2018-05-10 15:32:46Z

2

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);

answered May 10, 2018 at 15:32

Barmar

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1 Comment

epascarello Over a year ago

lol, I just typed [].concat(...array.map(d => Object.keys(d.values))) into my console to verify it worked before posting the answer.

Muhammad Usman · Accepted Answer · 2018-05-10 15:36:04Z

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(','))

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