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Get a specific bit from byte
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Easy. Use a bitwise AND to compare your number with the value 2^bitNumber, which can be cheaply calculated by bit-shifting.
//your black magic
var bit = (b & (1 << bitNumber-1)) != 0;
EDIT: To add a little more detail because...
How is mime type of an uploaded file determined by browser?
...erver-side, I am checking the mime type of the uploaded file, to make sure it is application/x-zip-compressed or application/zip .
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How to parse JSON using Node.js? [closed]
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You can simply use JSON.parse.
The definition of the JSON object is part of the ECMAScript 5 specification. node.js is built on Google Chrome's V8 engine, which adheres to ECMA standard. Therefore, node.js also has a global object JSON[docs].
Note - JSON.parse ca...
How to jump to a particular line in a huge text file?
...follow
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edited Sep 30 '16 at 19:28
gnat
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Does Java have a HashMap with reverse lookup?
...that is organized in kind of a "key-key" format, rather than "key-value". It's like a HashMap, but I will need O(1) lookup in both directions. Is there a name for this type of data structure, and is anything like this included in Java's standard libraries? (or maybe Apache Commons?)
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What are these ^M's that keep showing up in my files in emacs?
So I think it may have to do with textmate, but we work in a small team and are having some issues with full-file conflicts of nearly identical files in git because each line of one branch has a ^M appended to it.
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JavaScript: Create and save file [duplicate]
I have data that I want to write to a file, and open a file dialog for the user to choose where to save the file. It would be great if it worked in all browsers, but it has to work in Chrome. I want to do this all client-side.
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How do you round to 1 decimal place in Javascript?
...ar rounded = Math.round(number * 10) / 10
// rounded is 12.3
if you want it to have one decimal place, even when that would be a 0, then add...
var fixed = rounded.toFixed(1)
// fixed is always to 1 d.p.
// NOTE: .toFixed() returns a string!
// To convert back to number format
parseFloat(number....
Why are these constructs using pre and post-increment undefined behavior?
...havior when the code is run.
As far as I know, the standard doesn't explicitly say why the concept of undefined behavior exists. In my mind, it's simply because the language designers wanted there to be some leeway in the semantics, instead of i.e. requiring that all implementations handle integer ...
Custom Cell Row Height setting in storyboard is not responding
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On dynamic cells, rowHeight set on the UITableView always overrides the individual cells' rowHeight.
But on static cells, rowHeight set on individual cells can override UITableView's.
Not sure if it's a bug, Apple might be intentionally doing this?
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