CODEWITHSUNDEEP
javascriptnode.jsloopsobject
Michael
Michael

Reputation: 2046

Javascript Object Property Console.log

I have a javascript object:

[{  id: 11,
username: 'me',
firstname: 'my',
lastname: 'name',
}]

I'm trying to get the value of the firstname property, but I can't seem to do it. I thought I knew how to work with objects until this. I'm developing this within Node.js, which I don't think matters, but I'm new to node, so who knows.

Console.log reads the following for my different attempts:

console.log(typeof(user_info)) = object

console.log(typeof(user_info[0])) = object

console.log(user_info) = [{ id: 11, username: 'me', firstname: 'my', lastname: 'name', }]

console.log(user_info[0].firstname) = TypeError: Cannot read property 'firstname' of undefined

console.log(user_info[0]['firstname']) = TypeError: Cannot read property 'firstname' of undefined

console.log(user_info['firstname']) = undefinded

console.log(user_info.firstname) = undefinded

var output = '';
for(var prop in user_info){
    output += prop + ': ' + user_info[prop] + '; ';
}
console.log(output);

=

0:[object Object];

for(var prop in user_info[0]){
    console.log(user_info[0][prop]);
}

=

11
me
my
name

I feel like I'm so close with the last shot, but I can't wrap my mind around how to get the key while using the for in loop. What am I missing?

**I'm using Firefox, if that helps. And though I like Chrome, in the current setting, I'm unable to use Chrome*

Upvotes: 0

Views: 2334

Answers (2)

Ivan Burlutskiy
Ivan Burlutskiy

Reputation: 1623

for(var prop in user_info[0]){
    console.log('key = ', prop);
    console.log('value = ', user_info[0][prop]);
}

prop - key what you need

Upvotes: 2

bits
bits

Reputation: 8340

You want key in for... in?

How about this...

for(var prop in user_info[0]){
    console.log(prop);
}

FWIW: console.log(user_info[0]['firstname']) prints 'my' in chrome.

Upvotes: 1

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