flatten

I have a Table that stores Hierarchical information using the Adjacency List model. (uses a self referential key - example below. This Table may look familiar ): category_id name parent ----------- -------------------- ----------- 1 ELECTRONICS NULL 2 TELEVISIONS 1 3 TUBE 2 4 LCD 2 5 PLASMA 2 6 PORTABLE ELECTRONICS 1 7 MP3 PLAYERS 6 8 FLASH 7 9 CD PLAYERS 6 10 2 WAY RADIOS 6 What is the best method to "flatten" the above data into something like this? category_id lvl1 lvl2 lvl3 lvl4 ----------- ----------- ----------- ----------- ----------- 1 1 NULL NULL NULL 2 1 2 NULL NULL 6 1 6 NULL NULL 3

My scenario: A PDF template with formfields: template.pdf An XFDF file that contains the data to be filled in: fieldData.xfdf Now I need to have these to files combined & flattened. pdftk does the job easily within php: exec("pdftk template.pdf fill_form fieldData.xfdf output flatFile.pdf flatten"); Unfortunately this does not work with full utf-8 support. For example: Cyrillic and greek letters get scrambled. I used Arial for this, with an unicode character set. How can I accomplish to flatten my unicode files? Is there any other pdf tool that offers unicode support? Does pdftk have an

Given the following list of tuples: INPUT = [(1,2),(1,),(1,2,3)] How would I flatten it into a list? OUTPUT ==> [1,2,1,1,2,3] Is there a one-liner to do the above? Similar: Flatten list of Tuples in Python You could use a list comprehension : >>> INPUT = [(1,2),(1,),(1,2,3)] >>> [y for x in INPUT for y in x] [1, 2, 1, 1, 2, 3] >>> itertools.chain.from_iterable is also used a lot in cases like this: >>> from itertools import chain >>> INPUT = [(1,2),(1,),(1,2,3)] >>> list(chain.from_iterable(INPUT)) [1, 2, 1, 1, 2, 3] >>> That's not exactly a one-liner though. >>> INPUT = [(1,2),(1,),(1,2,3)] >

Given input: [{ a: 1 }, { b: 2 }, { c: 3 }] How to return: { a: 1, b: 2, c: 3 } For arrays it's not a problem with lodash but here we have array of objects. Use Object.assign : let merged = Object.assign(...arr); // ES6 (2015) syntax var merged = Object.assign.apply(Object, arr); // ES5 syntax Note that Object.assign is not yet implemented in many environment and you might need to polyfill it (either with core-js, another polyfill or using the polyfill on MDN). You mentioned lodash, so it's worth pointing out it comes with a _.assign function for this purpose that does the same thing: var

I'm trying to use AutoMapper to flatten multiple levels of arrays. Consider the following source classes: class X { public string A { get; set; } public Y[] B { get; set; } } class Y { public string C { get; set; } public Z[] D { get; set; } } class Z { public string E { get; set; } public string F { get; set; } } And the following destination: class Destination { public string A { get; set; } public string C { get; set; } public string E { get; set; } public string F { get; set; } } What I'd like to be able to do is get a List from one or more X, e.g.: Mapper.Map<IEnumerable<X>, IEnumerable

I want to take this val: val f = List(Future(1), Future(2), Future(3)) Perform some operation on it (I was thinking flatten) f.flatten And get this result scala> f.flatten = List(1,2,3) If the flatten method isn't appropriate here, that's fine. As long as I get to the result. Thanks! Gabriele Petronella Future.sequence takes a List[Future[T]] and returns a Future[List[T]] . You can do Future.sequence(f) and then use map or onComplete on it to access the list of values. 来源： https://stackoverflow.com/questions/26717249/how-to-flatten-a-list-of-futures-in-scala