When you are working with JSON data in Android, you would use JSONArray to parse JSON which starts with the array brackets. Arrays in JSON are used to organize a collection of related items (Which could be JSON objects). For example: [{“name”:”item 1″},{“name”: “item2”} ] On the other hand, you would use JSONObject when dealing … Read more
Change the line where you define selectedexpression to selectedexpression=${expressions[ $RANDOM % ${#expressions[@]} ]} You want your index into expression to be a random number from 0 to the length of the expression array. This will do that.
Very close! In your select expression, you have to use a pipe (|) before contains. This filter produces the expected output. . – map(select(.Names[] | contains (“data”))) | .[] .Id The jq Cookbook has an example of the syntax. Filter objects based on the contents of a key E.g., I only want objects whose genre … Read more
There exists a solution, which involves dynamic programming, that runs in O(n*TotalSum), where n is the number of elements in the array and TotalSum is their total sum. The first part consists in calculating the set of all numbers that can be created by adding elements to the array. For an array of size n, … Read more
In Scala you can use scala.util.Random: util.Random.shuffle((1 to 10).toSeq) //Vector(9, 6, 8, 7, 10, 1, 2, 5, 3, 4) util.Random.shuffle(List(‘A’, ‘B’, ‘C’, ‘D’, ‘E’, ‘F’)) //List(B, D, A, E, C, F) Your results may vary…
There’s a swap method on slices: data.swap(i, j). The original code doesn’t work because the language requires that &muts do not alias, that is, if a piece of data is accessible via an &mut, then there must be no other way to use that data. In general, for successive indexes data[i], data[j], the compiler cannot … Read more
How are arrays, having O(1) time to access or modify an indexed element, implemented in Haskell They are implemented via primitive operations in the runtime system for memory reads and writes. The safety of the side effecting action of destructively writing to memory is ensured via the use of monads to linearize access to the … Read more
Using the indexer limits what can be put or fetched for the object using the index syntax. E.g. foo is inferred to be of type string: interface IDictionary { [index: string]: string; } var params = {} as IDictionary; params[‘heart’] = ‘HP’; // okay var foo = params[‘heart’]; // foo:string The following on the other … Read more
You can also go with filter!: a = Any[“D”, “A”, “s”, “t”] filter!(e->e≠”s”,a) println(a) gives: Any[“D”,”A”,”t”] This allows to delete several values at once, as in: filter!(e->e∉[“s”,”A”],a) Note 1: In Julia 0.5, anonymous functions are much faster and the little penalty felt in 0.4 is not an issue anymore 🙂 . Note 2: Code above … Read more
Filtering an array is tricky if you consider possibility of elements containing spaces (not to mention even “weirder” characters). In particular answers given so far (referring to various forms of ${x[@]//pref*/}) will fail with such arrays. I have investigated this issue somewhat and found a solution however it is not a nice one-liner. But at … Read more