Retrieve specific values from hashes within an array ruby rails

Question

Noob question here!

I have an array with hashes that looks like this:

arr = [{id: 1, name: "Pedro"},{id: 2, name: "Pablo"}]

and want to have an array like this:

ids = [1,2]

I looked into using map or select like this:

ids = arr.each.select{|k,v| "id"==k}

But I can't figure it out.

Niklas B. · Accepted Answer · 2012-03-23 19:20:55Z

31

Try the following:

ids = arr.map { |x| x[:id] }

answered Mar 23, 2012 at 19:20

Niklas B.

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3 Comments

Niklas B. Over a year ago

@Cycle: Several reasons: First :[ is not a symbol, because [ is not a valid identifier. Secondly, you cannot use the & trick in conjunction with method arguments, because the precise syntax is method(arg1, arg2, ..., &x), where x is an expression that evaluates to a value that has a to_proc method. That to_proc method is called and the resulting Proc object passed as the block parameter to method.

sasikkumar Over a year ago

That's fine. I need to retrieve more than one value for example (id and name). Will it possible?

Niklas B. Over a year ago

@sasikkumare why would it not be possible?

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