Advertisements I’m new to reactive programming and I’m using reactor through micronaut framework and kotlin. I’m trying to understand the advantages of reactive programming and how we implement it using Map and FlatMap through Mono and Flux. I understand the non-blocking aspect of reactive programming but I’m confused if the operation on the data stream… Read More Is Reactor's FlatMap Asynchronous?
Advertisements I trying to collect the values of a pyspark dataframe column in databricks as a list. When I use the collect function df.select(‘col_name’).collect() , I get a list with extra values. based on some searches, using .rdd.flatmap() will do the trick However, for some security reasons (it says rdd is not whitelisted), I cannot… Read More convert a pyspark dataframe column in databricks as a list without using rdd
Advertisements I have an ArrayList<Train> List of class Train which has three data fields (source, destination, cost). I want to get all the place names, i.e source + destination places. I am using the below code, but as you can see, I could only come up with a way to do it with two streams.… Read More Java stream on specific fields in a custom class object
Advertisements I am trying to reverse a map that has a String as the key and a set of numbers as its value My goal is to create a list that contains a tuple of a number and a list of strings that had the same number in the value set I have this so… Read More Reverse a Map which has A Set as its value using HOF
Advertisements I have a big array of strings: [‘{{Wanted Value}}’, ‘true’, ‘{{Wanted Value}}’, ‘{{Wanted Value}} unwanted {{Wanted Value}}’, ‘false’…] I want to filter the array and extract every {{Wanted Value}} substring to a new array. If the item in the array contains 2 or more of these substrings, I want to have each of them… Read More How to extract a specific substring (based on regex) from an array of strings
Advertisements const my_arr = [ {id: 1, arr: [{subId: 1, value: 1}], {id: 2, arr: [{subId: 2, value: 2}], {id: 3, arr: [{subId: 3, value: 1}], ] how do I map over this array my_arr and then map over arr to return an array like so: [ {subId: 1, value: 1}, {subId: 3, value: 1},… Read More How to map through a deeply nested array of objects?
Advertisements I am trying to fetch all the keys of one nested object using Javascript but as per my code its not working as expected. I am explaining my code below. let jsonObj = { “service”:[ { “name”:”restservice”, “device”:”xr-1″, “interface-port”:”0/0/2/3″, “interface-description”:”uBot testing for NSO REST”, “addr”:”10.10.1.3/24″, “mtu”:1024 } ], “person”: { “male”: { “name”: “infinitbility”… Read More Not getting all the keys of nested object using Javascript
Advertisements code: window.reddit.comments("uq0mzi").sort(‘hot’).fetch(function(res) { res[1].data.children.flatMap((item) => { console.log(item.data.body) item.data.replies.data.children.map(y => (y.data.body === undefined ? "" : console.log(" >>>"+y.data.body))) })}) what I’m trying: I’m using the reddit API wrapper to get comments and their replies of a post. first map prints out the top level comments, while the second map is supposed to print out the… Read More Nested map function resulting in a TypeError after finishing execution
Advertisements I have a Student class: public class Student { private String name; private String marks; private List<Integer> percent; } There is a List defined as below in another class: stud1.setMarks("20"); stud1.setName("Sumit"); stud1.setRollNo(1); stud1.setPercent(Arrays.asList(20,30,40)); stud2.setMarks("50"); stud2.setName("Thakur"); stud2.setRollNo(2); stud2.setPercent(Arrays.asList(25,35,45)); stud3.setMarks("70"); stud3.setName("Dhawan"); stud3.setRollNo(3); stud3.setPercent(Arrays.asList(50,60)); List<Student> list = new ArrayList<Student>(); list.add(stud1); list.add(stud2); list.add(stud3); I want to perform operation… Read More Perform stream operation on the sub-lists inside a List<List<Integer>>
Advertisements I have this code that returns cartesian product of three arrays: function getcartesianProduct(symbols: Array<string>) { const cartesian = <T,>(…sets: T[][]) => sets.reduce<T[][]>((accSets, set) => accSets.flatMap(accSet => set.map(value => […accSet, value])), [[]]); return cartesian(symbols, symbols, symbols).map((items: Array<string>) => items.join("")); } For example, like this: >> const numbers: Array<string> = "0123456789".split(""); >> getcartesianProduct(numbers).slice(0, 5) ["000", "001",… Read More Javascript: How to populate arguments passed to a function?