question about "into"

[Base]

Hi All -

I have a question about into.

When you run the into against a map you get a vector of

(into [] {:a 1 :b 2})

=> [[:a 1] [:b 2]]

However when you use a for in front of this you get the full map.

(into [] (for [_ (range 1)] {:a 1 :b 2}))

=> [{:a 1, :b 2}]

Why is this? I would have expected them both to yield the same
results...

Thanks

Bassel

[Per Vognsen]

The second case is equivalent to (into [] [{:a 1 :b 2}]). You're
passing a singleton list containing a single element which happens to
be a map.

-Per

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[Sean Devlin]

The REPL is you best friend whenever you have a question like this.
It's often useful to execute the offending form step by step, to see
what the result of each computation is.

Love the REPL.

Sean

On Apr 7, 8:45 pm, Per Vognsen <per.vogn...@gmail.com> wrote:
> The second case is equivalent to (into [] [{:a 1 :b 2}]). You're
> passing a singleton list containing a single element which happens to
> be a map.
>
> -Per
>

[Per Vognsen]

Indeed, and in the absence of single stepping (manual or automatic),
some simple trace macros can be very useful. Here's what I use right
now:

http://gist.github.com/360102

-Per