# About this series

This is series of daily JavaScript coding challenges... for both beginners and advanced users.

Each day I’m gone present you a very simple coding challenge, together with the solution. The solution is intentionally written in a didactic way using classic JavaScript syntax in order to be accessible to coders of all levels.

Solutions are designed with increase level of complexity.

## Today’s coding challenge

```
Create a function that will receive a bi-dimensional array as argument and a number and will extract as a unidimensional array the column specified by the number
```

(scroll down for solution)

## Code newbies

If you are a code newbie, try to work on the solution on your own. After you finish it, or if you need help, please consult the provided solution.

## Advanced developers

Please provide alternative solutions in the comments below.

You can solve it using functional concepts or solve it using a different algorithm... or just solve it using the latest ES innovations.

By providing a new solution you can show code newbies different ways to solve the same problem.

## Solution

```
// Solution for challenge43
var ar = [ ["John", 120],
["Jane", 115],
["Thomas", 123],
["Mel", 112],
["Charley", 122]
];
var numbers = extractCol(ar, 1);
println(numbers);
function extractCol(ar, colNo)
{
var arCol = [];
for(var i = 0; i < ar.length; i++)
{
arCol.push(ar[i][colNo]);
}
return arCol;
}
```

To quickly verify this solution, copy the code above in this coding editor and press "Run".

Note: The solution was originally designed for codeguppy.com environment, and therefore is making use of

`println`

. This is the almost equivalent of`console.log`

in other environments. Please feel free to use your preferred coding playground / environment when implementing your solution.

## Discussion