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Why Does OAuth v2 Have Both Access and Refresh Tokens?

... can return both an access_token (which is used to authenticate oneself with a resource) as well as a refresh_token , which is used purely to create a new access_token : ...
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How do I make a column unique and index it in a Ruby on Rails migration?

...umn unique in Ruby on Rails migration script. What is the best way to do it? Also is there a way to index a column in a table? ...
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Return first N key:value pairs from dict

...ch keys were inserted first. You can get any n key-value pairs though: n_items = take(n, d.iteritems()) This uses the implementation of take from the itertools recipes: from itertools import islice def take(n, iterable): "Return first n items of the iterable as a list" return list(isli...
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How to find index of all occurrences of element in array?

...arameter that specifies the index to start searching from, so you can call it in a loop to find all instances of a particular value: function getAllIndexes(arr, val) { var indexes = [], i = -1; while ((i = arr.indexOf(val, i+1)) != -1){ indexes.push(i); } return indexes; } v...
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Possible reasons for timeout when trying to access EC2 instance

...on timed out. What could be the reasons why, and what can I do to resolve it? Rebooting normally takes a long time to take effect, and might just makes things worst ...
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What is the best alternative IDE to Visual Studio [closed]

...xpand my horizons and see what else there is on offer as an alternative to it. So what in your opinion is the best alternative to Visual Studio? Is there a viable alternative? ...
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Sorting an array of objects by property values

...follow | edited Jun 18 at 18:45 Abhishek 4,99833 gold badges99 silver badges2727 bronze badges ...
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Java: is there a map function?

...m(Collection<E>, Function<E,E2>) method provides the functionality you require. Example: // example, converts a collection of integers to their // hexadecimal string representations final Collection<Integer> input = Arrays.asList(10, 20, 30, 40, 50); final Collection<String&gt...
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What's the difference between a word and byte?

I've done some research. A byte is 8 bits and a word is the smallest unit that can be addressed on memory. The exact length of a word varies. What I don't understand is what's the point of having a byte? Why not say 8 bits? ...
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Vertically centering a div inside another div [duplicate]

...ours is the safer way to go for those. But since you tagged your question with CSS3 and HTML5 I was thinking that you don't mind using a modern solution. The classic solution (table layout) This was my original answer. It still works fine and is the solution with the widest support. Table-layout w...