get all values from javascript array

Question

I have array like this:

a = [{"province":"Western"},{"province":"Central "},{"province":"Southern "}]

in javascript. I want to extract all province and put it as in data as mentioned below.

data: [{id: 'province1', text: 'province1'},{id: 'province2', text: 'province2'},
       {id: 'province3', text: 'province3'}]

I tried it with for loop.

for (index = 0; index < a.length; ++index) {
    console.log(a[index]);
}

But, it's giving me character values..

I will just quickly add that a faster for-loop defines the iterating variable, and the length, outside (above) the actual loop. Just something to think about. — ndugger
– ndugger, Commented May 22, 2014 at 17:46

hugomg · Accepted Answer · 2014-05-22 17:26:44Z

3

You can build the ids by concatenating a string with a numeric id:

"province" + index // "province1"

Summing up

var data = [];
for (index = 0; index < a.length; ++index) {
    data[index] = { id: 'province' + (index+1), text: a[index].province} ;
}

answered May 22, 2014 at 17:26

hugomg

70.4k30 gold badges168 silver badges257 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Exception · Accepted Answer · 2014-05-22 17:41:12Z

1

var a = [{"province":"Western"},{"province":"Central "},{"province":"Southern "}], b = {};

for(var i = a.length; i--; b[a[i].province] = a[i].province);

console.log(b);

Demo

Result is

 {Southern : "Southern ", Central : "Central ", Western: "Western"}

Edit as per the comment:

var a = [{"province":"Western"},{"province":"Central "},{"province":"Southern "}];
a = a.map(function(v){
    return { id : v.province, text : v.province };
});

console.log(a);

edited May 22, 2014 at 17:41

answered May 22, 2014 at 17:32

Exception

8,43924 gold badges89 silver badges141 bronze badges

8 Comments

user3609998 Over a year ago

Why it's giving me object if I am alerting the variable? In console.log it seems ok

Exception Over a year ago

@user3609998 You cannot alert an object, try alert(JSON.stringify(b))

user3609998 Over a year ago

we need output in array.. [{Southern : "Southern ", Central : "Central ", Western: "Western"}] (like this)

hugomg Over a year ago

@user3609998: alert expects a string parameter so your object will be converted to a string, which will be "[Object object]" by default. This is one of the reasons you should use console.log instead of alert for debugging.

user3609998 Over a year ago

actually I need to use variable b like data in this example: jsfiddle.net/pHSdP/2

|

Collectives™ on Stack Overflow

get all values from javascript array

2 Answers 2

Comments

8 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

8 Comments

Your Answer

Sign up or log in

Post as a guest

Related