JavaScript. Extract values from associative array

Question

How can I get the values from this associative array in JavaScript?

I just need the email addresses and not the labels.

(
  {
    office = ("[email protected]");
    home = ("[email protected]");
    work = ("[email protected]");
  },
  {
    home = ("[email protected]");
  }
)

UPDATE: Prefered output in JSON would be:

{
    "data": [
        {
            "email": "[email protected]"
        },
        {
            "email": "[email protected]"
        },
        {
            "email": "[email protected]"
        },
        {
            "email": "[email protected]"
        }
    ]
}

Thankful for all input!

score 4 · Answer 1 · edited May 23 '17 at 12:29

4

What you probably meant to do is:

var x = [{
 office: ("[email protected]"),
 home: ("[email protected]"),
 work: ("[email protected]")
},
{
 home: ("[email protected]")
}]

and:

for(var j = 0; j < x.length; j++)
{
    for(var anItem in x[j])
    {
        console.log(x[j][anItem])
    }
}

// EDIT: however, it's not the best practice to use for … in.

Maybe you could change your data structure to:

var x = [[{
        value: "[email protected]",
        type: "office"
    },
    {
        value: "[email protected]",
        type: "home"
    },
    {
        value: "[email protected]",
        type: "work"
    }],
    [{
        value: "[email protected]",
        type: "home"
    }]];

and iterate over using:

for( var i = 0, xlength = x.length; i < xlength; i++ )
{
    for( var j=0, ylength = x[i].length; j < ylength; j++ )
    {
        console.log(x[i][j].value);
    }
}

edited May 23 '17 at 12:29

Community

1
1

answered Apr 19 '11 at 18:49

pawlik

2,385
19
18

I cannot change the data structure. I am developing an iPhone application in Appcelerator and this is what I get when I request information from the build in addressbook. They best would be if I could get the final output (addresses only) in JSON format. Is this possible? – Jonathan Clark Apr 19 '11 at 19:14
The current out put is now: [["[email protected]"],["[email protected]"],["[email protected]"],["[email protected]"]] in JSON. I would be cool if this could be: {"data": [{"email": "[email protected]"},{"email": "[email protected]"},{"email": "[email protected]"},{"email": "[email protected]"}]}. Is this possible? – Jonathan Clark Apr 19 '11 at 19:18

Sapphire_Brick · Answer 2 · 2020-06-10T14:16:58.923

4

Here's a one-liner:

console.log(Object.keys(assoc).map(k => assoc[k]));

where assoc is your associative array.

Edit

I have a better answer here.

edited Jun 10 '20 at 14:16

answered Dec 26 '19 at 22:42

Sapphire_Brick

1,560
12
26

Tejs · Answer 3 · 2011-04-19T18:57:22.910

1

You can 'foreach' over the object to get it's properties:

for(var j = 0; j < mySet.length; j++)
{
    for(var propName in mySet[j])
    {
        var emailAddress = mySet[j][propName];
        // Do Stuff
    }
}

edited Apr 19 '11 at 18:57

answered Apr 19 '11 at 18:45

Tejs

40,736
10
68
86

I got an error with the above code (myObj) changed it to mySet and made an alert of emailAddress but each alert was empty. What is wrong? – Jonathan Clark Apr 19 '11 at 18:54
This time it worked perfectly! Thanks! Is it possible to rename all labels to the same name for example the word email instead of work? – Jonathan Clark Apr 19 '11 at 19:06
You can translate those values into another object of your choosing. – Tejs Apr 19 '11 at 19:43
he current out put is now: [["[email protected]"],["[email protected]"],["[email protected]"],["[email protected]e"]] in JSON. I would be cool if this could be: {"data": [{"email": "[email protected]"},{"email": "[email protected]"},{"email": "[email protected]"},{"email": "[email protected]"}]}. Is this possible? – Jonathan Clark Apr 19 '11 at 19:44

score 0 · Answer 4 · answered Apr 19 '11 at 21:04

0

Answer for edited question:

var ret = {data: []};

for(var j = 0; j < x.length; j++)
{
    for(var anItem in x[j])
    {
        ret.data.push({
            email: x[j][anItem]
        });
    }
}

console.log(ret);

The result is kept in ret.

answered Apr 19 '11 at 21:04

pawlik

2,385
19
18

score 0 · Answer 5 · answered Mar 01 '20 at 14:55

Is it your input in JSON format? Because if so, it's the wrong syntax. However

let _in = [
 {
   office : "[email protected]",
   home : "[email protected]",
   work : "[email protected]",
 },
 {
   home : "[email protected]"
 }
]

let _out = []
_in.forEach( record => {  
   _out =  _out.concat(Object.values(record).map(x => new Object({email : x})))
})

console.log(_out)

for each record I extracted values and "packed" into an object with the "email" attrbiute, then I merged all those arrays obtained from the original array of records

score 0 · Answer 6 · answered Jun 10 '20 at 14:14

0

It seems that you're looking for Object.values.

answered Jun 10 '20 at 14:14

Sapphire_Brick

1,560
12
26

Please give the specific answer that refer to the question – Ray Coder Jul 23 '21 at 12:35

JavaScript. Extract values from associative array

6 Answers6

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