Here's my code:

obj = {"TIME":123,"DATE":456}

console.log(obj.TIME);
console.log("---------")

for (var key in obj) {
  console.log(key);
  console.log(obj.key);
}

It prints as the following:

123
---------
TIME
undefined
DATE
undefined

Why does console.log(obj.key) print as undefined?

I want my code to print out the following, using obj.key to print out the value for each key:

123
---------
TIME
123
DATE
456

How do I do so?

Here's my code:

obj = {"TIME":123,"DATE":456}

console.log(obj.TIME);
console.log("---------")

for (var key in obj) {
  console.log(key);
  console.log(obj.key);
}

It prints as the following:

123
---------
TIME
undefined
DATE
undefined

Why does console.log(obj.key) print as undefined?

I want my code to print out the following, using obj.key to print out the value for each key:

123
---------
TIME
123
DATE
456

How do I do so?

• javascript
• json
• loops
• undefined
• key-value

Share Improve this question Follow asked Jul 21, 2017 at 22:10 bobbob 63955 silver badges2525 bronze badges

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1 Answer 1

Sorted by: Reset to default 7

because there is no key in the object with the name 'key'. obj.key means you are trying to access a key inside obj with the name key. obj.key is same as obj['key']

you need to use obj[key], like this:

obj = {"TIME":123,"DATE":456}

console.log(obj.TIME);
console.log("---------")

for (var key in obj) {
  console.log(key);
  console.log(obj[key]);
}