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How do you know when to use fold-left and when to use fold-right?
...like a list iteration, one that would be simple to write in tail-recursive form, foldl is the way to go.
But really this will be probably be most evident from the associativity of the operators you are using. If they are left-associative, use foldl. If they are right-associative, use foldr.
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Elastic search, multiple indexes vs one index and types for different data sets?
...ill incur more storage with each additional shard being created and the performance gain is marginal.
Recommended if your data set is big and your queries are taking a long time to process, since dedicated shards are storing your specific data and it will be easier for Elasticsearch to process.
Im...
iPad keyboard will not dismiss if modal ViewController presentation style is UIModalPresentationForm
...r reasoning is that the user is often going to be entering data in a modal form so they are trying to be "helpful" and keep the keyboard visible where ordinarily various transitions within the modal view can cause the keyboard to show/hide repeatedly.
edit: here is the response of an Apple engineer...
Convert Data URI to File then append to FormData
...k is to extract an image file from the canvas object and append it to a FormData object for upload.
14 Answers
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Run command on the Ansible host
... work with command? Because as far as I know we cannot use the param free_form to define the command that will be executed
– Ander
Sep 8 '16 at 4:40
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Preview an image before it is uploaded
...ogleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form runat="server">
<input type='file' id="imgInp" />
<img id="blah" src="#" alt="your image" />
</form>
Also, you can try this sample here.
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Cloning a private Github repo
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Private clone URLs take the form git@github.com:username/repo.git - perhaps you needed to use git@ rather than git://?
git:// URLs are read only, and it looks like private repos do not allow this form of access.
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Read an Excel file directly from a R script
... can obviously loop over them all], included plots, etc.). But for a well-formed, rectangular spreadsheet with plain numbers and character data (i.e., not comma-formatted numbers, dates, formulas with divide-by-zero errors, missing values, etc. etc. ..) I generally have no problem with this process...
Should I use JSLint or JSHint JavaScript validation? [closed]
...be a good balance. It catches stuff that's a legitimate bug or really bad form, but doesn't bark at me like JSLint does (sometimes, in ways I can't disable) for the stylistic opinions or syntactic nitpicks that I don't care for.
A lot of good libraries aren't Lint'able, which to me demonstrates ...
What's the syntax for mod in java
...l add a bit of additional context. % the "modulus" operator is actually performing the remainder operation. The difference between mod and rem is subtle, but important.
(-1 mod 2) would normally give 1. More specifically given two integers, X and Y, the operation (X mod Y) tends to return a value...