How do I iterate through this object using JavaScript?

Question

Let's say I have the follow:

var test_data = {
'numGroup1': [[(1, 2, 3, 4, 5), (5, 6, 7, 8, 9)]],
'numGroup2': [[(10, 11, 12, 13, 14), (15, 16, 17, 18, 19)]],
};

How would I go about iterating through it using JavaScript?

• Ian: for (var key in test_data) {}
• Ian: You do know that the values become [[5, 9]] and [[14, 19]], right?
• Mohan Shanmugam: What is your expected output and purpose of iteration?
• Joshua: Ah, I didn't know that the parenthesis were causing that. I was just given data in that format.
• Ian: @Josh Yeah, the comma operator causes the expression to evaluate to its last operand

Answer 1

var test_data = {
 'numGroup1': [[1, 2, 3, 4, 5], [5, 6, 7, 8, 9]],
 'numGroup2': [[10, 11, 12, 13, 14], [15, 16, 17, 18, 19]],
};
for(var key in test_data){
 group = test_data[key];
 for(var num in group){
 console.log(group[num]);
 } 
}

@Ian is right... using () will not do anything but enter the last digit of each group. You should use a multidimensional array

 'numGroup1': [[1, 2, 3, 4, 5], [5, 6, 7, 8, 9]],
 'numGroup2': [[10, 11, 12, 13, 14], [15, 16, 17, 18, 19]],

• Joshua: Thanks combining this with the lan's response solved the problem.

Answer 2

You can use underscorejs to iterate over it

var test_data = {
 'numGroup1': [[1, 2, 3, 4, 5], [5, 6, 7, 8, 9]],
 'numGroup2': [[10, 11, 12, 13, 14], [15, 16, 17, 18, 19]],
};
_.chain(test_data).map(function(value, key) {
 return value;
 }).flatten().each(alert);

• Joshua: Thanks, I like the underscore variation too, but I'll give it to Jay as it was the first one to solve my problem.