arrays

问题 I have a collection of strings in an array. These strings are the JSON paths that i select from a checkbox tree. var selected = ['a', 'b.c.0.d', 'b.c.1.d', 'b.c.0.e', 'b.c.1.e']; I want to save it to the database with the real data given by the user. So i want to create a JSON object like following structure. It can be further nested. { "a":5, "b":{ "c":[ { "d":5, "e":5 }, { "d":5, "e":5 } ] } } 来源： https://stackoverflow.com/questions/59882169/how-to-build-a-json-object-using-collection-of

问题 I have a collection of strings in an array. These strings are the JSON paths that i select from a checkbox tree. var selected = ['a', 'b.c.0.d', 'b.c.1.d', 'b.c.0.e', 'b.c.1.e']; I want to save it to the database with the real data given by the user. So i want to create a JSON object like following structure. It can be further nested. { "a":5, "b":{ "c":[ { "d":5, "e":5 }, { "d":5, "e":5 } ] } } 来源： https://stackoverflow.com/questions/59882169/how-to-build-a-json-object-using-collection-of

问题 This question already has answers here : How to aggregate values into collection after groupBy? (3 answers) Closed 8 months ago . I have a dataset like below; with values of col1 repeating multiple times and unique values of col2. This original dataset can almost a billion rows, so I do not want to use collect or collect_list as it will not scale-out for my use case. Original Dataset: +---------------------| | col1 | col2 | +---------------------| | AA| 11 | | BB| 21 | | AA| 12 | | AA| 13 | |

问题 This question already has answers here : Filter array of objects with another array of objects (9 answers) Closed 5 months ago . I'm new to Javascript and I'm struggling with how to use the map, filter, find and other functions. I have two arrays of objects, and I wanted to filter the first one with the second. const users = [ { name: 'Anna', age: 22, gender: 'F' }, { name: 'John', age: 25, gender: 'M' }, { name: 'Mary', age: 27, gender: 'F' }, { name: 'Joe', age: 30, gender: 'M' } ] const

问题 I simply want to compare the first col of the datatable called "name" to items in the array. They can be multiple rows in the datatable with the same name. After it has compared all items in the array it should delete the rows that were NOT from the datatable. The output result can be the datatable itself or list array (prefer this) however this should retain all the columns from datatable. Possibly want to use linq query. code: DataTable dt = new DataTable("TestTable"); dt.Columns.Add(new

问题 I got 2 arrays ArrayA = {"data":{"PlayerList":[{"Platform":1,"PlayerExternalId":205288,"Price":250,"RemainingTime":22},{"Platform":1,"PlayerExternalId":205753,"Price":10000,"RemainingTime":22}]}} ArrayB = {"datafut": [{"currentPricePs4": "4149000","currentPriceXbox": "3328000","PlayerExternalId": "151152967"},{"currentPricePs4": "3315000","currentPriceXbox": "2720000","PlayerExternalId": "151198320"}]} ArrayB is like a small database to compare prices. ArrayA needs theoretically an

问题 After migration from Visual Studio 2012 to 2013 some PInvoke calls not working as previously. For example, I'm struggling with this code: Signature: [DllImport(LzoDll64Bit)] private static extern int lzo1x_decompress(byte[] src, int src_len, byte[] dst, ref int dst_len, byte[] wrkmem); Usage: byte[] dst = new byte[origlen]; int outlen = origlen; if (Is64Bit()) lzo1x_decompress(src, src.Length - 4, dst, ref outlen, _workMemory); else lzo1x_decompress32(src, src.Length - 4, dst, ref outlen,

问题 I am trying to sum the unit value by date, and create a new array where there are no duplicate dates. For example, I want to calculate the total of 2015-12-04 00:01:00 . This date has occurred 2 times in the following data, its value is 5 and 6 , which is going to be: [{date: '2015-12-04 00:01:00', unit: 11}, ... etc] I have tried arr = results.map(x => x.unit).reduce((a,c) => a + c) but it only return a single value, not an array. results = [ { unit: 5, date: '2015-12-04 00:01:00' }, { unit:

问题 I am trying to sum the unit value by date, and create a new array where there are no duplicate dates. For example, I want to calculate the total of 2015-12-04 00:01:00 . This date has occurred 2 times in the following data, its value is 5 and 6 , which is going to be: [{date: '2015-12-04 00:01:00', unit: 11}, ... etc] I have tried arr = results.map(x => x.unit).reduce((a,c) => a + c) but it only return a single value, not an array. results = [ { unit: 5, date: '2015-12-04 00:01:00' }, { unit:

问题 I am attempting to write an array of the first N primes to a txt file in rows of 5 entries each, with 10 spaces between each entry. The relevant code is as follows: #include<stdio.h> #include<math.h> #define N 1000 ... void writePrimesToFile(int p[N], char filename[80]) { int i; FILE *fp = fopen(filename, "w"); for(i = 0; i<=N-1; i++) { for(i = 0; i<5; i++) { fprintf(filename, "%10%i", p[i]); } printf("/n"); fclose(fp); } printf("Writing array of primes to file.\n"); } The compiler throws the