This past October I spoke on behalf of Map Your World at the 2015 Geo for Good User Summit.
Map Your World empowers youth to explore issues and ideas that matter - like clean drinking water, or food justice – then write surveys, collect data, and create maps to make change in their communities. This amazing project is powered by the Ona API.
Below is a video of the talk I gave, which includes a clip from the film The Revolutionary Optimists.
Given the following function definition, what would you expect to happen if you
ran (hello :person nil)?
(defn hello
[& {:keys [person]
:or {person "Rich"}}]
(str "Hello, " person))
(hello) => "Hello, Rich"
(hello :person "Hickey") => "Hello, Hickey"
(hello :person nil) => "Hello, "
I’d have expected (hello :person nil) to have the same result as calling
(hello), but as it turns out, Clojure seems to make a distinction between
nothing and nil when it comes to destructuring.
A real world situation where this might occur would be where you, for instance,
rely on the result of a destructuring operation to provide parameters for a
function similar to hello. e.g.
(defn spam
[& {:keys [person]}]
(str (hello :person person)
"Give me all your money."))
Calling (spam) would result in (hello :person nil) being called, which would
have the - probably - unintended effect of returning "Hello, ". You may choose
to add an :or when destructuring the argument to spam, but then you’ll have
the same code appearing twice. A more localised solution would be changing the
hello definition to be something like this.
(defn hello
[& {:keys [person]}]
(str "Hello, " (or person "Rich")))
This worked for my case, but I’d love to hear about more idiomatic approaches.
Today we are announcing the launch of Ona Collect, a tweaked version of ODK Collect created especially for Ona users. This new mobile client is a baby step into building a seamless experience for our users, starting with a few small improvements.
Continue reading A New Client for Smartphones: Ona Collect...
Ona is conducting an online survey to better understand challenges faced by our users. If you use Ona now — or have in the past — we’d like to hear from you. Click here to take the survey.
Please take a few minutes to complete the survey. It’s your chance to help us define our roadmap! Responses to this survey will be used internally only — and all individual responses will be kept strictly confidential.
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Thank you for your participation.
The 3 week free trial for Ona is ending tomorrow and we’ll be enabling usage limits for users who have not signed up for a paid plan.
Starting tomorrow, users with personal accounts that are not on a paid plan will be transitioned to the free Community plan. This plan has a limit of 500 submissions total to private forms per month, 15 private forms, and 1 private project. Public project and forms, and submissions to public forms are unlimited.
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If you have existing forms on Ona that put you over your account limits, you will have limited access to your forms and account. For more information on what to do if you are over limit, read the over usage limit FAQ on our help page.
If you haven’t signed up yet and are interested in upgrading to a paid plan, please visit the Ona Plans page and contact us using the form. We’ll work with you to determine a pricing level for your use. If you aren’t grant-funded, you can also apply for the Impact Grant Program , which gives free Ona access and support to organizations who are making a difference and might have difficulty paying.